Vibram Men's Bikila Ls 5f / Lsm355gg Rubber Trainer synthetic-and-fabric Coconut Active Carbon Fibre Upper - Designed to superbly breathable and odor resistant, the Coconut upper improves comfort through dynamic shoe performance. LS - (Lacing System) - The Vibram Lacing System allows for a wider tongue opening for easier step-in and out and the adjustable elastic means you can secure the shoe perfectly to the form of your foot, increasing comfort and 4mm Vibram TC-1 Rubber Outsole - designed anatomically to give the best protection where you need it most Single Hook and Loop Closure - helps pull the upper tight round the contours of your feet so it feels like a second skin 3mm Polyurethane Footbed with Dri-Lex Sockliner - offers cushioning and comfort where you need it most. The footbed is also thickest under the ball of the foot where you will strike the ground when running in a more natural style