The One-Piece Ankle Strap contours to the shape of your boot and provides durability without extra weight. The C-Series Chassis pairs an aluminum heel cup with a polycarbonate base tray. The aluminum heelcup provides the feel and durability of aluminum where you need it while the composite tray offers comfort and a smooth ride. The canted footbed aligns your joints with a 2.5 degree angle while providing more leverage over the tip and tail of your board. The C-4 is designed for all-mountain freestyle performance on a budget.