The C-Series Chassis pairs an aluminum heelcup 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 One-Piece Ankle Strap offers all day comfort. 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 CL-4 is designed for riders seeking a smooth all-mountain binding that is comfortable all over the mountain.