30 Day Unconditional Guarantee
For Trek, Bontrager and Electra products, if for some reason you're not 100% happy with your purchase, you can return it within 30 days for a refund - no questions asked!
Trek Ballista Mips – Performance for the Podium
The product of extensive research and development in the pursuit of racing faster, the Ballista is Trek’s fastest and most aerodynamically advanced helmet. With a suite of pro-level features like the Mips Air safety system and the customisable BOA fit system, the Ballista is the go-to helmet for the days when speed is the top priority.
Best aero helmet overall
"... a helmet I absolutely loved as soon as I took it out of the box... incredibly light... excellent glasses retention…"
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How to ride more safely
Want to do more than wear a helmet? Check out this guide to riding safer.
Learn moreHow to clean your bike helmet
To ensure that 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
Our fastest helmet ever
Ballista is the fastest helmet in Trek's line-up. Its aerodynamic efficiency saves riders 10.1 watts of power and more than one bike length during a final sprint versus the Velocis in a standard one-hour test.
Unexpectedly light
The Ballista is light. At 275 grams, its minimalistic, low-profile design makes for a faster helmet that's lighter than ever before.
Cool is fast
Insight from computational fluid dynamic analysis helped optimise vent and channel design for more efficient airflow, creating a cool helmet.
A better fit
For that Goldilocks fit, the Ballista features a single-lace, 360° BOA® fit system with two lace height positions and three yoke positions – offering complete customisation.
Secure storage
The Ballista’s rubberised side vents make it easy to stow away your sunglasses when you’re not wearing them.
A clear view
The Ballista features a bevelled edge above the brow that opens up your field of view and lets you easily see the road ahead – even when tucked in the drops.
Virginia Tech 5-STAR Rating
The Ballista has received a 5-STAR safety rating from Virginia Tech's third-party testing facility, an unbiased, industry-accepted assessment of the level of protection a helmet provides to a cyclist.
Crash 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 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 | M | L |
|---|---|---|---|
| Circumference | 51-57 cm | 54-60 cm | 58-63 cm |
| Fit system | BOA® | BOA® | BOA® |
| Pad material | Moisture wicking pads | Moisture wicking pads | Moisture wicking pads |
| Buckle type | Lightweight buckle | Lightweight buckle | Lightweight buckle |
| Includes | Crash Replacement Guarantee, NoSweat pad and travel bag | Crash Replacement Guarantee, NoSweat pad and travel bag | Crash Replacement Guarantee, NoSweat pad and travel bag |
| Weight | 265g | 275g | 295g |