Ski helmet size guide :
Bike helmet size guide:
Thanks to DIEZZ Activlux photochromic 1 to 3 technology, your screen adapts to all weather conditions.
No need to change screen according to brightness, the tint of your screen adjusts automatically thanks to a treatment integrated into the heart of the material to offer you the best UV protection, as well as perfect visibility. The range of protection adapts equally well to overcast, end-of-day conditions (category 1) and sunny, bright conditions (category 3). For optimum comfort and fit, the screen is fitted with triple-density thermoformed foam.