For Plantar Fasciitis, Arch Pain & Edema! Forget thick and bulky--this foot sleeve is made using the same process as medical compression stockings. With 6 targeted support zones to reduce swelling that causes pain, strengthens and improves vascular foot health. Plus 3 graduated compression levels throughout the sleeve to assist circulation and relieve swelling. Thin, lightweight material will provide moderate compression. Expect a strong, snug fit. Sizes by arch circumference: MD (7"-10" dia.) LG (9"-13" dia.) XL (11"-15" dia.). You get one single sleeve that fits either foot.