From OOFOS, the Women's OOlala Recovery Thong Sandals feature: OOfoam® technology upper absorbs 37% more impact than traditional footwear Closed-cell foam is machine washable and designed to minimize odor Slip on styling Proprietary footbed design reduces stress on knees, ankles and other joints Enables more natural motion Cradles your arches Tread patterned foam outsole Approx. 1.5" platform heel Imported.