For the rider looking for high-end materials and a high-performance all-mountain binding. The A-4 uses the same super responsive and lightweight highback we've had in the past. The One-Piece Ankle Strap offers performance and comfort without the extra bulk and weight. The cored nylon highback is designed for responsiveness without the additional weight. The A-Series Aluminum Chassis provides the reactive flex and power transfer of aluminum with less rigidity than previous designs. In need of lightweight all mountain performance binding? Then, this is the binding for you.