The Skull Dura X SPIN ski race helmet features new and innovative Race Lock technology for more security while racing. Ski racers can lock the helmet tightly to their head to minimize vibrations at the very high speeds reached in elite racing. Developed so that the adjustment system does not interfere with race position, Race Lock turn wheel technology sits perfectly in line with the helmet shell and can be adjusted with gloves on so racers can fine-tune the fit immediately before a race run.