Giro Cinder Bike Helmet MIPS Matte Green Small. Giro's cinder bike helmet is equipped with MIPS technology to reduce rotational forces when the helmet gets hit at an angle. The full-wrap, In-Moldpolycarbonateshell gets reinforcement from the Roc Loc 5 fit system that ensures proper fit, and Wind Tunnel ventilation adds cool comfort. Multi-Directional Impact Protection System (MIPS) inside the helmet is designed to reduce rotational forces that can result from certain impacts Roc Loc 5 fit system offers one-handed adjustment of fit tension and vertical position with a ratcheting, micro-adjustable dial In-Mold polycarbonate shell with EPS liner Thermo-formed roll-cage reinforcement Super Fit engineering combines with Roc Loc system for a secure fit Air-FX padding wicks moisture Wind Tunnel ventilation includes 26 vents Webbed adjustable straps with buckle-clasp closure Fit system: Roc Loc