Adult Helmets on Sale

An aerodynamic, high-performance road bike helmet with advanced WaveCel technology. A major advancement in the protection against cycling-related head injuries Bontrager XXX WaveCel LTD delivers high-performance protection and the best in aerodynamics and comfort. XXX is the WaveCel helmet of choice for the Trek-Segafredo men's and women's teams, and this LTD version is available in a run of limited edition colorways. WaveCel is a collapsible cellular structure that lines the inside of the helmet. This Bontrager-exclusive technology disrupts the safety standards the industry has accepted for over 30 years. Product details - WaveCel advanced helmet technology - BOA® Fit System lets you easily secure and adjust helmet fit with just one hand - Easy-to-use adjustable strap dividers allow for a fine tune fit - An aerodynamic shape helps you outsmart the wind and ride faster - Additional NoSweat pad with silicone channel keeps sweat out of eyes for constant clarity - Crash Replacement Guarantee provides a free helmet replacement if involved in a crash within the first year of ownership

At just 850 grams, the Sanction is our low-profile full-face helmet aimed at dirt shredders and BMX riders who don’t need the more robust Full-9 or Transfer-9. The Sanction has become the choice of adults who want full-face protection but prefer a smaller size and profile. If you’re riding a chairlift, go with a Full-9 or Transfer-9. But if you’re pedaling BMX or dirt jumps, this helmet will serve you well.

Ultra-versatile helmet that is light, cool, and sleek with the added protection of WaveCel advanced helmet technology and the convenience of magnetic light mounts. If you're going to get just one helmet, make it this one Whether your finish line is on the race course or at your front door, Bontrager's Circuit WaveCel delivers the right performance, comfort, and tech to be your go-to helmet for any ride. It's equipped with features any rider will appreciate on any terrain, like WaveCel technology, a BOA Fit System for superior comfort and security, and the Blendr mount system for easy light and camera integration. WaveCel is a collapsible cellular structure that lines the inside of the helmet. This Bontrager-exclusive technology disrupts the safety standards the industry has accepted for over 30 years. Product details - WaveCel advanced helmet technology - BOA Fit System lets you easily secure and adjust your fit with one hand - Blendr magnetic mount system easily integrates a GoPro camera and Bontrager lights - Made of 50% recycled EPS material - FlatStrap semi-fixed strap dividers lay flush and move fore and aft for a perfect fit - Soft, comfortable, moisture-wicking, and washable helmet pads - Reflective elements on the back of the helmet offer enhanced visibility - Crash Replacement Guarantee provides free replacement if your helmet is impacted in the first year of ownership

The Proframe helmet is the lightest and most breathable full face helmet Fox has ever created. Designed to perform at the highest levels for the aggressive all mountain rider and enduro racer, it packs DH certified protection into a superlight shell via Fox's patent-pending, fully-integrated Chinbar. With 24 Big Bore vents, the Proframe offers open face level airflow and breathability to keep you cool on even the longest and most challenging climbs; and once you reach the top, it gives you the confidence to ride to your limits on even the toughest of descents. Features: - Ultra-lightweight enduro and all mountain helmet - Patent pending integrated chinbar - Highly breathable, moisture wicking and anti-microbial liner - 24 Big Bore vents for unrivaled breathability - Fixed visor is positioned perfectly for maximum air flow - Fidlock SNAP helmet buckle provides quick entry and exit - MIPS™ impact protection system reduces rotational forces in a crash - Dual density Varizorb EPS liner provides improved protection - Our lightest DH certified helmet: 750g. (size medium) Certifications: - ASTM F1952 (including chin bar rigidity test) - EN 1078 - AS/NZ 2063 - CPSC

All-purpose, value-packed helmet balances performance and comfort with the added protection of MIPS. All-purpose protection for every rider The Solstice MIPS helmet is proof you don't have to spend a lot of money to get a great fitting, great looking, and easy-to-use bike helmet. Featuring MIPS, Multi-directional Impact Protection System, it includes a sleek built-in brim with plug ports for a clean look when the additional visor is removed. MIPS (Multi-directional Impact Protection System) was developed by brain surgeons and scientist to help reduce rotational forces on the brain caused by angled impacts to the head. Product details - MIPS Brain Protection System - Fidlock magnetic buckle fastens effortlessly for a quick, secure fit - Intuitive, one-handed Headmaster fit system adjusts height and circumference - Built-in and removable visor options give you two choices for constant coverage - LockDown dividers make helmet strap management clean and easy to adjust - Internal, recessed channels move airflow over your head to keep you cool and dry - Soft, comfortable, moisture-wicking and washable helmet pads for added comfort - Crash Replacement Guarantee provides a free helmet replacement if involved in a crash within the first year of ownership Specifications - Size (head circumference): Small/Medium (51-58cm); Medium/Large (55-61cm) - Fit system: Headmaster II - Pad material: Moisture wicking pads - Buckle type: Fidlock buckle - Includes: Visor plugs - Weight: 335g (Small/Medium)

Riding is for everyone, so we created the Camber to provide a dialed fit for rippers of all sizes, from kids on up. The Camber comes equipped with all the comfort, style, and ventilation to make every ride a joyride. Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older. - Camber earned the highest 5-Star Virginia Tech Helmet Rating from internationally renowned Virginia Polytechnic Institute and State University. - The MIPS system is a low-friction layer that allows a sliding motion of 10 to 15mm in all directions. Studies indicate that this reduces some of the rotational forces transmitted to the brain during angled impacts. - With x-small to x-large options spread across five unique shell sizes, the Camber eliminates excess bulk to deliver a comfortable and streamlined fit to a full range of riders. - Easily-adjustable, one-size Headset SX fit system with adjustable Tri-Fix web splitters delivers an easy and accurate fit. - 4th Dimension Cooling System optimizes ventilation. - In-molded shell improves strength and reduces weight. - This helmet is ANGi ready, with a fit system mount designed for easy integration with our ANGi crash sensor. - Average weight: 370 grams (medium).

Fitness rides, adventure rides, family rides around the neighborhood. With its easy, approachable style, the Trace MIPS is an all-around performer that gives you loads of options. All-Purpose Performer - INTEGRATED MIPS—Integrated MIPS (Multi-Directional Impact Protection System) is designed to reduce rotational forces that can result from certain impacts. By integrating the MIPS slip plane into the retention system, we are able to reduce complexity and weight for a compact, better ventilated helmet that fits more closely to the head. - ERGO FIT—A lightweight fit system with an easy-to-turn rubber overmolded dial for adjustments (integrated with MIPS). - NO-TWIST TRI-GLIDES—Quick-adjust fasteners that help keep straps flat and properly positioned - SWEAT GUIDE—Sweat Guide pad design pulls moisture away from the brow pad and away from eyewear. Complies with the US CPSC Safety Standard for Bicycle Helmet for Persons Age 5 and Older

Toddlers need head protection too Protect the young cyclist in your life with the Little Dipper toddler helmet, featuring a built-in visor and easy-to-use magnetic buckle. Perfect for little ones riding in a trailer, a child carrier, or all on their own. Product details - In-molded EPS shell with full coverage for protection and durability - Fidlock magnetic buckle fastens effortlessly for a quick, secure, kid-friendly fit - Soft, removable helmet pads can easily be cleaned - Dialed fit system provides a secure and comfortable fit - Adjustable helmet straps provide a clean look and easy fit management - Helmet meets ASTM standards—their tests use a smaller mass headform more realistic to younger riders - Crash Replacement Guarantee provides free helmet replacement if it is involved in a crash within the first year of ownership Specifications - Size (head circumference): Toddler (46-50cm) - Fit system: HB-80 - Pad material: Moisture wicking pads - Buckle type: Fidlock buckle - Weight: 239g

Affordable MIPS™ trail helmet for young riders Don't take chances with their most precious asset - their brain. The Youth Mainframe Helmet delivers the goods to young riders, offering them the same proven safety features older riders get in their Mainframe helmet, and all with the same easy trail style. Featuring extended coverage to protect more of their noggin', the proven MIPS™ impact protection will keep their brain safe in the event of a crash by absorbing and redirecting energies and forces that could otherwise damage it. Featuring a lightweight fit system, the Youth Mainframe Helmet will also keep young heads cool and well vented. Should the sweat stank build up, you can easily whip out the moisture-wicking liner and run it through the wash to get them riding fresh again in no time. Great protection at a price that won't break the bank. - Proven MIPS™ impact protection system reduces rotational forces in a crash - Extended coverage for added safety - Optimized venting with channeled, in-molded EPS provides efficient cooling - Removable, washable moisture wicking liner - MIPS™ integrated fit system reduces weight and provides a more comfortable, seamless fit - EPS, PC, PA, polyester

Cooler, Faster in a Protective Package The trailblazing A2 is Troy Lee Designs’ MTB trail helmet that checks all the boxes. Its stylish shell not only incorporates huge intake and exhaust ventilation ports, but it also comes with the very best in impact protection. From breakaway visor screws and the innovative MIPS® system and an industry-first dual-density EPP + EPS liner that protects against both high and low-speed impacts; this is a helmet that doesn’t take your safety lightly. Add in an adjustable strap and X-Static® Pure Silver comfort liner and the comfort is every bit on par with the protection. - MIPS (Multi-directional Impact Protection System) - Patent pending, industry-first dual density EPP = EPS impact liner - Innovative break-away visor screws help reduce the likelihood snagging during a crash - Low-profile, semi-adjustable strap dividers - X-Static® Pure Silver comfort liner

The Flight Sport is the entry-level version of our BMX dirt jump helmet. A single-density layer of EPS combined with our proven ABS hard outer shell inspires confidence for riders of any age and experience level. Features - Dirt jump and trail specific functionality - Single density EPS liner - Thin ABS shell for reduced weight - 8 large Big Bore vents for increased airflow - Heat-sealed comfort liner for a clean look and feel

It's All in Your Tactic. With an unprecedented combination of fit, ventilation, and confidence for trail and enduro riding, the Tactic helmet delivers exceptional coverage and seamless integration with goggles or glasses. - Tune a more precise, personalized fit thanks to Tactic's slim, incredibly adjustable Integrated Fit System that accommodates variations in head shape and occipital base. - Occipital base adjustment personalizes fit for comfort and allows you to tune helmet angle to ensure that your helmet and eyewear stay perfectly synched. - Integrated fixed visor provides increased trail vision and a seamless interface with eyewear. Specifically designed eyewear channels always give you a spot to store your glasses at a moment's notice. - 380 grams (medium) of lightweight performance. - Computational Fluid Dynamic design integrates the maximum volume of internal channeling for optimal airflow through the helmet drawing heat away from the head. 4D brow cooling, which provides a gap between the helmet and forehead, draws airflow into internal air channels at every speed. - Whether you're riding acoustic or e-MTB, the Tactic passes the e-bike Standard NTA8776 so you can can send it with confidence on whatever bike choice you make. - The Tactic earned the highest 5-Star Virginia Tech Helmet Rating from the internationally renowned Virginia Polytechnic Institute and State University. - Fitted with a MIPS Evolve solution to provide 10 to 15 millimeters of rotation in every direction. - Integrated fit system allows for extended (occipital) coverage. - This helmet is ANGi ready, with a fit system mount designed for easy integration with our ANGi crash sensor. Sizing: - Small = 51 – 56cm - Medium = 55 – 59cm - Large = 58 – 62cm

Stylish, affordable, MIPS™ trail helmet The Mainframe MIPS™ Helmet gives you exactly what you're looking for in an affordable helmet: proven safety features combined with easy trail steez. Featuring extended coverage to protect more of your noggin', the proven MIPS™ impact protection will keep your brain safe in the event of a crash by absorbing and redirecting energies and forces that could otherwise damage it. With a lightweight fit system, the Mainframe MIPS Helmet will also keep you cool, and should the sweat stank builds up, you can easily whip the moisture-wicking liner out and run it through the wash. Great protection at a price that'll save your wallet undue stress. - Proven MIPS™ impact protection system reduces rotational forces in a crash - Extended coverage for added safety - Optimized venting with channeled, in-molded EPS provides efficient cooling - Removable, washable moisture wicking liner - MIPS™ integrated fit system reduces weight and provides a more comfortable, seamless fit - Weight: 390 g, medium - EPS, PC, PA, polyester

Performance-focused open-face trail helmet - MIPS' added protection system has been proven to reduce the rotational motion when implemented in a helmet by absorbing and redirecting energies and forces otherwise transmitted to the brain - Dual-density Varizorb EPS provides improved protection by spreading forces of impact across a wider area - Fidlock SNAP helmet buckle provides quick and secure entry and exit while wearing gloves - Removable, washable XT2 liner is antimicrobial and manages odor while wicking moisture away from the head - Optimized venting with channeled, in-molded EPS provides efficient cooling - Goggle compatible, 3 position adjustable visor - 360°Fit System allows you to dial in your perfect fit every ride - EPS, PC, PA, Polyester

Dirt Jump and Trail Specific Mountain Bike Helmet The Flight Sport Helmet is the entry-level version of our new BMX/dirt jump helmet. A single-density layer of EPS combined with our proven ABS hard outer shell inspires confidence for riders of any age and experience level. Features - Dirt jump and trail specific functionality - Single-density EPS liner - Thin ABS shell for reduced weight - 8 large Big Bore vents for increased airflow - Heat sealed comfort liner for a clean look and feel - Small = 20.875 – 21.25in - Medium = 21.675 – 22in - Large = 22.5 – 22.875in Certifications - CPSC - EN 1078 - AS/NZS 2063

Our Pro-Level Downhill Full-Face Mountain Bike Helmet The Rampage Pro Carbon Diaz Helmet features an ultra-ventilated design and two rotational management systems. It offers the most complete levels of performance and protection ever offered in a gravity helmet. Under the light and robust Multi-Composite Technology shell is a dual-density EPS, meant to provide improved impact protection by distributing the force of impact over a wider surface area. The Magnetic Visor Release System (MVRS) adds an additional layer of rotational management by purposely detaching from the helmet in the event of a crash. Finally, Fluid Inside technology, which mimics your body's natural cerebral spinal fluid, is meant to help manage both linear and rotational impact energy. This arsenal of helmet tech is paired with a luxury interior which features 19 expansive vents and a premium X-static moisture-wicking comfort liner Features - Magnetic Visor Release System (MVRS) allows the visor to detach during a crash - Dual-density Varizorb EPS liner is meant to provide improved impact protection - CAGE chin bar/eye port is intended to improve energy management in the event of an impact - MCT (Multi-Composite Technology) shell provides an excellent balance of strength & weight - Mesh vent screens provide airflow while maintaining protection from dirt and debris - 19 total vents - 15 intake & 4 exhaust vents to channel cool air in and hot air out - Fluid Inside ensures optimal linear and rotational impact performance - Removable, washable X-static moisture-wicking & antimicrobial comfort liner - 3 shell sizes & 4 EPS sizes for the best in class fit - Stainless steel D-ring closure - Includes zippered helmet bag - Weight: 1230g in a size M (+-50g) Sizing - Small = 21.75 – 22.25in - Medium = 22.25 – 23.25in - Large = 23.25 – 23.75in - X-Large = 23.75 – 24.75in Certifications - CPSC - EN 1078 - AS/NZS 2063 - ASTM 1952-15 Downhill

- MIPS' added protection system has been proven to reduce the rotational motion when implemented in a helmet by absorbing and redirecting energies and forces otherwise transmitted to the brain. - Dual-density Varizorb EPS provides improved protection by spreading forces of impact across a wider area - 8 Big Bore vents and 7 exhaust vents keep you cool and aid in moisture management - The securely fixed visor is positioned to channel airflow into the Big Bore vents - Fidlock SNAP helmet buckle provides quick and secure entry and exit while wearing gloves - Removable antimicrobial and moisture wicking liner - Includes additional pads for custom dialed fit

Our most affordable DH-certified mountain bike helmet Youth Rampage Helmet offers full face coverage to young park, BMX, downhill and enduro riders. It features MIPS and a lightweight injection-molded ABS shell inspired by our iconic Rampage Pro Carbon Helmet. Injected mesh vent screens maintain superior ventilation while keeping rocks and twigs at bay as you shred the trails. The fully adjustable visor and proven D–ring closure system adds big-mountain function to this essential style. - Proven MIPS™ impact protection system reduces rotational forces in a crash - Lightweight, injection molded ABS shell - Mesh vent screens provide ventilation while filtering dirt and debris - Double d-ring closure - Adjustable visor - CERTIFICATIONS - ASTM F1952-15

The Flight Helmet takes the traditional dirt-jump lid to all-new levels of protection, performance, and comfort. The M9 Multi-Sector liner uses 9 distinct segments for improved fit, comfort, and superior breathability. Additionally, it is made using our proprietary Varizorb Multi Density EPS foam which absorbs, disperses and reduces the force of impact to the head in crashes. - Dirt-jump and trail-specific functionality - M9 segmented EPS design for improved fit, flexibility, and comfort - Varizorb multi-density EPS liner provides improved protection - Thin ABS shell for reduced weight - 8 large Big Bore vents for increased airflow and lighter weight - Heat-sealed comfort liner for a clean look and feel

This race-inspired design is known for its incredible fit and tremendous value. It has many similar features to the S-Works Prevail, like the Tri-Fix webbing system and 4th Dimension Cooling, granting the Propero III incredible performance at a more attainable price. - MIPS-equipped. - Easy-adjust, HairPort FSL II fit system with four height positions and micro-adjustable dial. - 4th Dimension Cooling System with Mega Mouthport for enhanced comfort. - Composite matrix internal reinforcement allows larger vents for greater cooling. - Soft 4X DryLite webbing material won’t stretch out with sweat or water. - Tri-Fix web splitter for improved comfort and ease of strap adjustments. - This helmet is ANGi ready, with a fit system mount designed for easy integration with our ANGi crash sensor. - Our available aftermarket ANGi sensor gives you and your loved ones peace of mind like never before. When combined with our Specialized Ride app, the ANGi sensor will evaluate the forces acting on the helmet in the event of an accident and, if necessary, send a text message to your specified contacts with your location.

Performance-Focused Open-Face Trail Helmet The Speedframe Pro Helmet has earned Virginia Tech's best rating (5 STARS) in its Bicycle Helmet Ratings program. Designed with input from our pro mountain bike athletes, this top-tier open-face trail helmet offers a market-leading feature set including MIPS, an easily adjustable multi-position visor, and a 360-degree fit system. The pro version is equipped with a Varizorb dual-density EPS liner, Fidlock SNAP helmet buckle, and an XT2 antimicrobial comfort liner. Features - Proven MIPS impact protection system reduces rotational forces in a crash - Varizorb Dual-density Varizorb EPS - Fidlock SNAP helmet buckle provides quick and secure entry and exit while wearing gloves - Removable, washable XT2 liner is antimicrobial and manages odor while wicking moisture away from the head - Optimized venting with channeled, in-molded EPS provides efficient cooling - Goggle compatible, 3-position adjustable visor - 360 Fit System allows you to dial in your perfect fit every ride - Weight: 380g Sizing - Small = 51 – 55cm - Medium = 55 – 59cm - Large = 59 – 63cm Certifications - CPSC - EN 1078 - AS/NZS 2063

Proframe RS Mhdrn from Fox Racing.

LIGHTWEIGHT, NEXT-LEVEL FULL-FACE HELMET The Proframe RS Helmet takes the lightweight breathability of the Proframe and takes it to the next level of safety and performance. Featuring the all-new Mips® Integra Split protection system, which combines a dual density foam - for high and low speed impacts - and a low friction layer between the two layers designed to reduce rotational forces in a crash that would otherwise be transmitted to the brain. Designed to meet the needs of all-mountain riders and enduro racers, the increased ventilation and decreased surface contact of the helmet keep you cool on long rides, while the Ionic+ and anti-microbial liner and multi-sized cheek pads provide optimized comfort and fit. The updated BOA® fit system offers micro-adjustability providing class-leading fit and security. The chinstrap utilizes a Fidlock® magnetic closure system for easy-open and close, even with gloves. The 3-position adjustable visor with lock down screw is compatible with goggles. Those looking to capture every sweet run will appreciate the removable, under-visor GoPro mount on the Fox Proframe RS mountain bike helmet. Key features - BOA® fit system - Mips® Integra Split - Adjustable visor - Under-visor GoPro Mount

Mainframe Helmet Trvrs from Fox Racing.

Mainframe Helmet Trvrs from Fox Racing.

Ready, set, send. This next generation of our award-winning Smith Forefront mountain bike helmet has your back (and front, and sides) thanks to MIPS and complete Koroyd impact protection. Designed to work with goggles or sunglasses, the helmet vents warm air, eliminating foggy lenses so you'll feel confident even if your line of sight is less than ideal. And when your palms start to sweat right before you drop in, you'll stay cool thanks to a full 20 vents that keep the air flowing. The visor adjusts for easy goggle storage between laps, and you can slide your glasses for secure storage on the front or back. PROTECTION: Complete Koroyd coverage for lightweight, energy-absorbing and ventilated impact protection, MIPS Brain Protection System reduces rotational forces caused by angled impacts to the head, Integrated skeletal structure creates a roll cage for added strength and impact protection FIT / INTEGRATION: VaporFit dial adjustment system offers 270-degree fit adjustment with the turn of a dial, Designed for ultimate integration with Smith performance eyewear and goggles for maximum comfort, venting and storage convenience, AirEvac ventilation system integrates with Smith goggles and eyewear for fog-free lenses FEATURES: 20 fixed vents for consistent airflow, Three-position adjustable visor, Ionic+ antimicrobial lining offers sweat-activated odor control, Lightweight, low-bulk single-layer webbing, Front and rear eyewear storage channels WEIGHT: (Size M, MIPS) 14oz / 380g CERTIFICATION: CPSC,CE EN 1078

The helmet trusted by UCI World Cup champions. - MIPS added protection system is meant to reduce the rotational motion when implemented in a helmet by absorbing and redirecting energies and forces otherwise transmitted to the brain - Breakaway visor screws are designed to sheer off at impact to reduce rotational forces - Dual-density, In-Mold Varizorb EPS balances weight with performance and is meant to provide improved protection by spreading forces over a wider surface area - Lightweight carbon fiber shell construction - Injected Mesh vent screens maintain superior ventilation and airflow while shielding the rider from dirt and debris - Removable, washable X-Static comfort liner and cheek pads are antimicrobial and manage odor while wicking moisture away from the head - EPS, Carbon Fiber, Fiberglass, Nylon, Polyester

An evolution of our award-winning Forefront helmet, the completely redesigned Forefront 2 is a full-coverage helmet ideal for all-mountain riders who demand superior protection, ventilation and eyewear integration. For added protection, Koroyd has been extended into the back of the helmet to now fully encompass the helmet. Internal air channels are combined with open intake and exhaust ports to maximize ventilation, while AirEvac channels promote airflow to prevent fogging of your eyewear. The Forefront 2 also features channels on the front and rear of the helmet for eyewear storage, and a three-position visor that rotates high to allow for goggle storage. - Lightweight Aerocore in-mold construction - Zonal ventilated protection featuring patented Koroyd material - Integrated skeletal structure - MIPS system available in all colors - VaporFit adjustable fit system - 20 optimized vents - XT2 anti-bacterial performance lining - Ultra-light single layer webbing - AirEvac ventilation - Three-position adjustable visor - Ultimate sunglass and goggle integration - Integrated accessory mount sold separately - Weight (Size M, MIPS) 13.4oz / 380 grams - Certification: CPSC, CE EN 1078 Sizing - Small: 51 – 55cm - Medium: 55 – 59cm – Large: 59 – 62cm

The Trace is the pinnacle helmet in Smith's performance road collection. The Trace features Koroyd, which fully surrounds the helmet providing exceptional protection and works with the internal air channels and open intake and exhaust ports produce maximum ventilation. Storage and ventilation of eyewear is crucial on those long rides, the Trace’s AirEvac system relieves hot air that builds up on your eyewear to prevent fogging. Eyewear storage is made easy by channels on the side of the helmet that hold your eyewear in place for those grueling climbs. - Lightweight Aerocore in-mold construction - Complete ventilated protection featuring Koroyd - Integrated skeletal structure - VaporFit adjustable fit system - 18 optimized vents - XT2 anti-bacterial performance lining - Ultra-light single layer webbing - AirEvac ventilation - Ultimate eyewear integration - Light mount compatible - MIPS system in all colors - Weight: (Size M, MIPS) 10oz / 280 grams - Certification: CPSC Sizing - Small: 51 – 55cm - Medium: 55 – 59cm – Large: 59 – 62cm

The Speedframe Helmet has premium features usually found only on much more expensive helmets. A Mips liner designed to reduce rotational motion and redirect forces away from your brain should you crash, a goggle-compatible 3-position visor, and our 360-degree fit system makes the Speedframe one of the best values in open-face mountain bike helmets. Add in the legendary aggressive Fox design DNA, and you have one of the most shred-ready mountain bike helmets on the market today.