100% Waterproof Membrane, Upper material is a combination of microfiber, PU suede thermo-welded microfiber for durability and abrasion-resistance, Air ventilation details on lateral quarter with mesh openings for breathability, TPU ankle extended into lower lateral area, TPR slider detail on lateral toe box, TPR heel counter design, Asymmetric toe design, Traditional lace closure system, Tongue and collar padding, Internal toe box and heel counter reinforcement, Replaceable anatomical EVA footbed with Lycra lining on top, Rubber sole provides textured grip, absorption and features a support shank for enhanced sole rigidity