Acorn Women's Spa Thong with Premium Memory Foam Synthetic Synthetic sole Classic spa slipper- Super soft plush terry spa house slipper in classic flip flop design for all-year wear comfort; Skid-resistant, weatherproof rugged sole provides indoor & outdoor versatility. Memory foam + arch support- Soft multilayer cushion insole with quick-recovery memory foam foot bed for heel and arch support that cradles the contour of your foot. Durable rubber with anti-skid texture on the bottom gives you safe and secure footing. Slip on comfort- Open toe style with comfortable and breathable support that surrounds your feet and toes in cloud like comfort; Marshmallow-like cushion for tired toes and heels, helps reduce muscle fatigue and relieves pain and pressure. Versatile- All season flip flop slipper with skid-resistant, durable and lightweight sole. Easily portable; great for spa, Yoga, gym, home, office, school, hospital, travel, indoors, outdoor. Sizing and Care- Memory foam will conform to your foot with each use. Small (5-6), Medium (6.5-7.5), Large (8-9), X-Large (9.5-10.5). Available in XX-Large (11-12) in Black, Grey, Natural, Taupe, Periwinkle, and Turq. Available in wide widths in Black and Natural in S, M, L, XL. Easy care: Machine wash and dry.