Vibram Five Fingers Women'S Wm Bikila Trainer Nylon Vibram sole Stretch Polyaminde Upper - designed for a superb glove-like fit, with TPU toe caps for protection and with padded collar and topline for great comfort 4mm Vibram TC-1 Rubber Outsole - designed anatomically to give the best protection where you need it most 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 Single Hook and Loop Closure - helps pull the upper tight round the contours of your feet so it feels like a second skin Weight : 272 Grams