Less wind. More win.
When speed is your top priority and every watt counts, reach for the helmet that'll cut through the wind to save you seconds. Ballista is Trek's fastest, most aerodynamically-advanced helmet.

• An aerodynamic road bike helmet that is undeniably fast, yet surprisingly light, cool, and comfortable.
• Trek's fastest, most aerodynamic helmet saves big watts and shaves crucial seconds
• An excellent ventilation system makes this aero helmet surprisingly cool and comfortable
• The Mips Air system is light, cool, and designed to help reduce rotational forces
• The single-lace BOA® fit system is fully adjustable to provide a custom, 360° fit
• Rubberized sunglasses docking port provides secure and easy-to-use storage
• Crash Replacement Guarantee provides a free helmet replacement if involved in a crash within the first year of ownership