Vissla Surf Bootie fit is true to shoe size and should fit snug to prevent water from entering. Made for cold water: 49 - 58° F / 9 - 14° C Product Features and Sizing 100% Super Stretch neoprene - lighter, warmer, softer, stretchier, easier to put on and take off Full thermal lining insulates heat and dries fast Thin softgrip sole design allows for a better, true-to-the board feel Strapless compression panels keep the boot snug to your feet without having to have the restricting velcro strap Sole is solid underneath the split toe to prevent leash hangups Glued and blindstitched seam construction Treat with special care! Rinse booties thoroughly inside and out with fresh water Lay flat to dry in a cool shaded area and avoid placing in direct sunlight Size Guide US Sizes 7 8 9 10 11 12 13 Euro Sizes 39 40 41 42 43 44 45 UK Sizes 6 7 8 9 10 11 12