casco USA Speed Time Bike Helmet Aerodynamic aspects of theSPEED timeadapt to the body position and posture of the athlete's head Uncompromisingly streamlined and delivers top aerodynamics The sophisticated double-shell construction supports the unprecedented streamlined design of the helmet Due to its large dimension across the face and ears of the athlete the SPEED mask provides best aerodynamics and prevents air vortex formation Enables even from the lowest position a trouble-free field of view