KJ PRO7 Black - Red Size M (inner sole 28.5cm) – this is a PRO Series model, black/red, size: S, M, L, XL, unisex model. This latest PRO Series model is ideally designed for strong athletes and/or heavier users (over 90kg). It can return up to 2x the energy of the standard XR Series. It incorporates all the latest patented Swiss KJ technology and the new, heavy duty ShellXH, as well as the SRS (Safety Release System).The multi-size liner, adapts perfectly to several sizes. It features a better performance, increased comfort, new customizing possibilities, a longer life span, a 2 way safety feature with locking system. It has a durable hard shell boot with a comfortable, removable, machine washable liner.