Bontrager Ballista Helmet
Comfy, light, and nearly invisible to the wind, Bontrager's Ballista Helmet is perfect for those who love a sleek, aggressive lid. What began as a prototype for Jens Voigt's hour record has turned into one of the fastest aero road helmets on the market. Six strategically placed vents channel air over your head so you stay cool while you stay fast. With an excellent fit thanks to the Headmaster II retention system and plenty of other technology to keep sweat and odors at bay, Bontrager's Ballista is ready to launch.
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I absolutely love this helmet, have tried many and this is by far my favorite one. The aero effects are noticeable, studies have shown that a good aero helmet offer aero benefits similar to aero 50mm wheels.