Textured phthalate-free vinyl thong strap. Firm EVA foot bed. Textured EVA foam outsole is partially made with renewable sugarcane. To measure your shoe size, place a piece of paper on the ground. Stand barefoot on the paper. Using a pen, draw an outline of your foot. Use measuring tape to measure the length of your foot on the paper. Wipe clean. synthetic materials, with synthetic outsole partially derived from sugarcane. 100%