Sizing 8.0-15.0 in (20.3-38.1 cm). Fits left or right foot. Measure the circumference approximately 2 inches above the ankle bone. Plantar fasciitis night support. Helps relieve plantar fasciitis symptoms. Firm support. Breathable material. Moisture wicking. 1. Designed to comfortably hold foot at the recommend position. 2. Comfortable, adjustable fit. Ideal for nighttime support while sleeping. Supported by our expert panel of medical professionals and engineers.