Lightweight and comfortable, the Bollé STANCE S cycling helmet (51-55 CM) offers easy size adjustment with the CLICK TO FIT system for a perfect fit. Twelve air vents ensure perfect air circulation, reducing the possibility of your head sweating inside the helmet. The helmet has reflective elements in the back of the helmet and on the chin strap for increased safety when riding in the dark. For even greater visibility, the helmet has an integrated LED light in an size adjustment wheel. The LED light is quick and easy to switch on and offering a choice of two modes, intermittent flashing or steady light.