There are two different ways to wear——you can wear it as sandals or flip flop. Constructed with lightweight and soft material. The upper is made of EVA Feature: Anti-Slippery, Hard-Wearing, Quick-Drying Perfect for indoor or outdoor use. Size Guide EUR Size US Size Insole Length(inch) Insole Length(mm) 36 4 8.5 216 37 4.5 8.7 222 38 5 9 228 39 6 9.3 235 40 7 9.5 242 41 8 9.8 250 42 9 10.1 257 43 10 10.4 264 44 10.5 10.6 270 45 11 10.9 278 46 11.5 11.3 286 47 12 11.6 294 48 13 11.8 300 Product measurements may vary by up to 3~5mmEU representative: Europe Gateway Intemational B.V., [email protected], Kraijenhoffstraat 137 A , , Amsterdam, 1018RG