Plantar Fasciitis Night Splint by Bird & cronin is developed to help reduce the discomfort and pain of plantar fasciitis. This splint is designed to be worn at bedtime stretching the plantar fascia. Supplies a consistent, 90-degree angle stretch on the plantar fascia by keeping the foot in gentle dorsi-flexion position. Soft, gentle padded splint provides superior comfort and protection from irritation to the skin. Comes with a removable foam wedge insert that gives you an additional five inch stretch on the plantar fascia. Fits right or left foot, use shoe size for correct sizing. LATEX FREE. Small Size fits male shoe size 5-6 and womens shoe size 5 1/2 - 6 1/2, MEDIUM Size fits male shoe size 6 1/2 - 7 1/2 and womens shoe size 7-8, LARGE Size fits male shoe size 8-9 and womens shoe size 8 1/2 - 9 1/2, XLARGE Size fits male shoe size 9 1/2 - 10 1/2 and womens shoe size 10-11.