The Giro Source MIPS helmet is designed to offer high performance with a rugged design that provides an optimal and updated pedaling experience and superior protection. The deep coverage is paired with 17 ventilation ducts, with the extra comfort and security of the Roc Loc 5 fit with the integration of the MIPS system, and full polycarbonate coverage throughout the helmet for increased durability. Features:- In-Mold Polycarbonate casing- MIPS system- 17 ventilation holes- Roc Loc 5 Adjustment System- Adjustable visor- Sizes S (51-55 cm), M (55-59 cm), L (59-63 cm)Technology:- MIPS systemMIPS leads in the market for slip plane technology in the helmet's interior which is designed to reduce any rotational impact from certain knocks. When the head rotates rapidly and comes to a sudden stop, the rotational acceleration can cause high levels of stress in the brain tissue. The tissue strain caused by these movements can result in various types of brain injuries.