DonJoy Performance Bionic Comfort Hinged Knee Brace Support Size: S/M Fits left or right Thigh: 15.5 – 21” Knee: 13 – 15” Calf: 12 – 16” Ergonomic Stabilizer Perforated neoprene ventilation Compression Heat retention Comfort Item is brand new & unused in box. Item will ship in poly mailer. We use recycled shipping materials.