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Rally WaveCel Product Overview
Rally WaveCel is a high-style, high-value off-road helmet with trail-specific features and WaveCel, a leading technology in the protection against cycling-related head injuries.
"It's in a class by itself"
"You can't put a price on safety, but this is a pretty good start"
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"Excellent style and features"
"Styling, retention system, and safety features score big at this price"
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"A good bang for your buck to protect your head"
"A very comfortable fit in a clean package"
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All your favorites, all in one place
Get all your favorite apparel from over 80 of the world's best cycling brands delivered right to your doorstep or local Trek retailer when you shop our curated online collection. If you're not 100% satisfied, you can return your purchase within 30 days for a full refund.
Shop all gearGo By Bike
Planet Earth is our home and our responsibility —we must do our part to preserve it. Learn how you can join the #GoByBike movement and help make a difference in the future of our planet and all who call it home.
Read moreHow to ride safer
Want to do more than wear a helmet? Check out this guide to riding safer.
Learn moreHow to clean your bike helmet
To ensure your bike helmet looks and performs its best, it's important to properly clean and care for it. Check out our simple guide to learn how to maintain your bike helmet. It's easy to do and takes little time!
Read moreProduct features
Rally WaveCel mountain bike helmet
An off-road helmet with WaveCel technology that balances comfort and performance for trail riders who value safety.
What is WaveCel?
WaveCel is a revolutionary helmet technology designed to be more effective than traditional foam helmets in protecting against certain cycling-related accidents. Its collapsible cellular structure lines the inside of your helmet and is designed to work like a crumple zone to absorb the force of an impact before it reaches your head. Click below to learn more.
A TIME Magazine Invention of the Year
Our breakthrough WaveCel helmet technology was included in TIME Magazine's list of 100 Best Inventions for making the world better, smarter, and even a bit more fun. Watch the video to learn more about the science behind this revolutionary helmet technology. From TIME
©2020 TIME USA LLC. All rights reserved. Used under license
Virginia Tech validation
All WaveCel helmets received the highest rating from Virginia Tech's third-party testing facility. This unbiased assessment proved Bontrager's WaveCel helmets to be among the highest level of protection available to cyclists with a 5-STAR rating.
BOA® fit system
Easily secure and adjust the helmet fit with just one hand.
Drop-in coverage
Extended, back-of-helmet shell offers additional rear protection.
LockDown strap dividers
Easily adjust straps to fit perfectly with adjustable, lightweight strap dividers.
Soft helmet pads
Super comfortable internal pads wick moisture on hot days and hard efforts and are easy to wash after a full day of fun.
Helmet buyers guide
Not sure which helmet is right for you? Check out our helmet buyer's guide to learn everything you need to know about bike helmets.
See the guideCrash Replacement Guarantee
With our Crash Replacement Guarantee, we will provide you with a free replacement helmet if it is involved in a crash within the first year of ownership. Simply contact us or your local retailer with the crashed helmet, original sales receipt, details of the incident, and a return address for your replacement.
Learn more30-Day Unconditional Guarantee
If for any reason you're not satisfied with a Bontrager or Trek aftermarket purchase, return the item, along with the original sales receipt to the original place of purchase within 30 days for an exchange or refund. Think of it as a 30-day test ride.
Learn moreOur helmets build the future
$1 from the sale of every Bontrager helmet in North America supports PeopleForBikes, which provides guidance, a rating system, a leadership conference, and professional support for transforming cities throughout the United States in the ongoing effort of becoming a bicycle friendly nation.
Learn moreHelmet Fit and Sizing
For your helmet to do its job, it's important that it's sized properly and fits well. Reference our sizing guide at the link below to find your ideal size and see how Bontrager helmets are intended to fit.
Learn more| Size | S | L | XL |
|---|---|---|---|
| Circumference | 51-57cm | 58-63cm | 60-66cm |
| Fit system | BOA® | BOA® | BOA® |
| Pad material | Moisture wicking pads | Moisture wicking pads | Moisture wicking pads |
| Buckle type | Standard buckle | Standard buckle | Standard buckle |
| Includes | Crash Replacement Guarantee | Crash Replacement Guarantee | Crash Replacement Guarantee |
| Weight | 360g | 430g | 435g |