Ease pain with an EFFECTIVE STRETCH of calf muscle and soft tissues of foot and ankle. Lightweight breathable material can be worn for hours as a supplement to traditional treatments. This medically proven product might feel uncomfortable at first, that’s to be expected as sock keeps a controlled stretch. Pull adjustable dorsiflexion strap to desired position for slight, gentle, effective stretch of plantar fascia. One sock per package. Two Sizes Available. Measure around the calf at widest point. Regular Size Fits Calf up to 16”. Large Size Fits Calf 17”-21”. Both sizes measure approximately 18 inches from floor to just below knee AND Both sizes Not Recommended for people below 5’ 4” tall. Height of Sock Works best if between 5'7" and 6'1". Top strap must rest between knee and top of calf. Thus, ensure you measure between 16"-20" from floor to area between knee and top of calf. Wear to bed for Plantar Fasciitis, Tight Calves and Achilles Tendinitis. Can help treat the first few painful steps in the morning.