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 . Please click for a video about how Vibram shoes should fit. Don't let a little snow get in your way of being the minimalist that you are. The Lontra from Vibram FiveFingers will keep you warm and on the trail through the entire winter. Built specifically to promote a barefoot-like experience. Ideal for running and trekking. 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. Laminated stretch mesh and water resistant membrane uppers with fully taped seams for added insulation. Upper envelopes the foot with a neoprene cuff and hook and loop closure to keep the snow and debris out. Micro-pile fleece liner is soft against the skin while helping to wick away perspiration. Reflective hits for added visibility. 4mm EVA midsole provides insulation from frozen surfaces. Vibram TC-1 Performance rubber provides exceptional underfoot feel without compromising abrasion resistance. Measurements: ; Weight: 8 oz ; Product measurements were taken using size 45 (US Men's 12-12.5), width D - Medium. Please note that measurements may vary by size.