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When every second counts, pick a helmet that precisely cuts across the wind. Designed for extreme speed, Trek's most aerodynamic helmet thus far is the Ballista. It is lightweight, airy, and has the built-in Mips Air system to increase protection without sacrificing performance or comfort.
Designed to cut drag, save watts, and acquire valuable seconds on the road, Trek's most aerodynamic helmet yet. Even at highest speeds, advanced ventilation keeps you cool and comfortable. Lightweight Mips Air system reduces rotational impact, improving protection. Precision-fitting For a snug, customized fit, BOA® dial systems offer 360° adjustability. One safe place to hide your sunglasses mid-ride is an integrated rubberized port. satisfies US CPSC guidelines for riders five years of age and above on helmet safety.
With less weight and smarter design, this helmet is built to perform. It features seamless integration, better sweat control, and advanced Mips technology to help manage rotational forces—so you stay comfortable, protected, and focused on the ride, no matter how hard you’re pushing.
The new Velocis features a sleek, low-profile design and refined components—like an OCLV Carbon inlay—that help shave off weight. In fact, it’s 6 grams lighter than the previous version, giving you that extra edge without sacrificing performance or style.
After extensive wind tunnel testing and advanced airflow simulations, the new design delivers a major performance boost—offering 38% better cooling and shaving 18 seconds off your time over 45 km/h. It’s built for speed, without breaking a sweat.
To ensure your helmet performs its best, it’s essential that it fits properly. Use our sizing guide below to find your perfect fit and learn how Bontrager helmets are designed to fit securely.
Size
S
M
L
Circumference
51 - 57 cm
20" - 22"
54 - 60 cm
21" - 24"
58 - 63 cm
23" - 25"
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