Used Cannondale Quick Mountain Bike Helmet Large Size for sale. Quick helmet by Cannondale offers great style at a great price. This nice lid also features 19 vents for excellent ventilation, featuring a sturdy, one-piece polycarbonate outer shell. It also boasts dual-density EPS foam for bulkless safety. The retention system features EVA foam padding and soft-touch straps with cam-lock dividers which allow you to dial in perfect fit.