Vibram FiveFingers KSO - Men's Abrasion-resistant stretch polyamide fabric with Hypalon straps. FiveFingers stimulate the muscles in your feet and lower legs to build strength, endurance, and improve your range of motion. Antimicrobial microfiber footbed for odor resistance. Vibram TC-1 performance rubber sole for traction on any terrain. Machine washable, air dry.