The VALEGRO polycarbonate shell profile has been tested and refined by KASK engineers in conjunction with a wind tunnel to achieve optimal thermal cooling performance. The VALEGRO offers advanced ventilation and an impressive weight of just 180g (small size). This new design provides maximum cooling through 37 ventilation holes and a new breathable, quick-drying liner. The 5mm layer of thermoformed, three-dimensional, fast-weaving liner is antistatic, bacteriostatic, thermoregulating, and wicks away moisture via Resistex Carbon. In addition to this cutting-edge technology, the eco-leather chin strap ensures all-day comfort.