FiveFingers are designed around the foot's measurement in inches. There is no real 100% translation between your US size and FiveFingers size. In order to find the right size, please measure both feet from heel to tip of longest toe with a ruler in inches. Take the longest measurement for your longest foot and refer to our women's size chart or men's size chart .Please click here for a video about how Vibram shoes should fit.Where will your day take you? On trail? Through the bustling city streets? Perhaps over your favorite running path? Wherever it leads you, trek freely in the adventure-bound versatility of the KSO from Vibram FiveFingers®. Built specifically to promote a barefoot-like experience.Ideal for running, fitness, water sports, yoga and pilates, on- and off-road adventures, as well as everyday casual wear. Fit Tips:1. Insert foot, slipping each toe into the individual toe pockets. It may work best to begin with the big toe.2. After each toe is in place, slip heel in and adjust until it is snuggly in place.3. Secure the strap, making sure it lies flat across top of foot. Wiggle toes and adjust strap until you find the ideal fit. Thin, abrasion-resistant stretch polyamide and breathable mesh upper materials. Upper envelopes the foot to help keep debris out. Individual toe pockets promote muscle strengthening in the feet and lower legs, as well as improve balance, agility and range of motion. Adjustable, hook-and-loop Hypalon® strap wraps the top of foot through the heel for a secure fit.Heel pull loop for an easier on and off.2mm, antimicrobial, microfiber footbed offers light underfoot cushioning.Non-marking, 3.5mm Vibram® TC-1 Performance rubber provides exceptional underfoot feel without compromising abrasion resistance.Durable outsole design helps protect feet from hot surfaces and rugged terrain, while thin razor-sipping heightens flexibility and slip resistance over wet and dry surfaces. Imported. Measurements: Weight: 5 ozProduct measurements were taken using size 40 (US Women's 9), width B - Medium. Please note that measurements may vary by size.