Flow Fuse brown 2019/20 Baseplate Glass-Filled Nylon, Rockered Fuse Series Hiback Glass-Filled Nylon - GF Nylon provides a balanced combination of direct performance, sensitivity and comfortable support. Asym UniBack - Unique, asymmetric UniBack system is lightweight, with a balanced sense of support and comfort. Strapy Fusion Powerstrap - Fusion is 3D