Oofos Unisex Ooriginal Thong Flip Flop, Mint, 6 M US Women / 4 M US Men's 100% Synthetic Imported Oofoam sole OOfoam Recovery Technology absorbs 37% more impact than traditional footwear foam Patented footbed cradles your arches to reduce stress on sore feet, ankles, knees and lower back Biomechanically designed to allow natural motion Machine washable