Designed to provide relief from pain and discomfort of plantar fasciitis and achilles tendonitis. Allows the patient to apply consistent stretch to the the plantar fascia by holding the foot in gentle dorsiflexion (bending the ankle upward). Lightweight design for comfort while sleeping. Slip resistant sole for greater safety. Fits either left or right foot. SMALL SIZE Mens Shoe Sizeup to size 7, womens shoe size up to 7 1/2.