Vibram Fivefingers Bikila LS Sport Shoes Synthetic Stretch polyamide with TPU toe caps for protection. 3mm polyurethane footbed with Dri-Lex sockliner. 4mm anatomical pod outsole design distributes forefoot impact without compromising ground feel. EVA arch follows the contour of the foot and reduces weight. 4mm Vibram TC-1 performance rubber outsole for grip and protection without compromising ground feel.