Size Medium: Men's Shoe Size 7 1/2 - 10, Ladies Shoe Size 8 1/2 - 11 1/2. The SB Low Top Closed Toe Air Fracture Boot is a top of the line pneumatic (air pump and liner bladder) protective boot. This Closed Toe Air Medical Boot allows you to adjust the level of desired compression with ease. Features an adjustable reinforced toe guard, an inflatable liner with easy release technology and quick release, and easy to manage fastening straps. SB Low Top Closed Toe Air Fracture Boot is a top option for people suffering with soft tissue injuries, grade 2 and 3 sprains, stable fractures and patients that are in need of post-operative stabilization. This Medical Boot will help to reduce pain, swelling and edema of foot and ankle, without costing a small fortune.