Designed to meet the needs of demanding athletes, the Donjoy Stabilizing Speed Pro Ankle Brace reduces the chance of ankle injury by 61%1. Featuring a contoured design made with rugged ballistic nylon, reinforced eyelets, 3” circumferential compression strap and removable articulated stays. The Stabilizing Speed Pro brace gives trainers confidence that the vulnerable ankles of their athletes are protected. In addition to all the benefits of the Stabilizing Pro, the new Stabilizing Speed Pro brace features a “speed-lacing” system that makes applying the brace exceptionally fast and easy. Features: Circumferential 3” Elastic Strap Provides tibia/fibula compression and stability Secures all strapping Strapping that performs consistently Non-stretch figure-8 straps lock calcaneus providing ideal inversion/eversion control Articulated Stays (inside) Removable medial/lateral stays provide additional support and stability without compromising comfort New and Improved streamlined design Fits comfortably into athletic or street shoes Non-Stretch Ballistic Nylon Rugged material for demanding athletes Delivers comfort, performance and durability Description Measurement Size x = 1 = XS 10" - 11" (25 - 28 cm) XS x = 2 = S 11" - 12" (28 - 30 cm) S x = 3 = M 12" - 13" (30 - 33 cm) M x = 4 = L 13" - 14" (33 - 36 cm) L x = 5 = XL 14" - 15" (36 - 38 cm) XL x = 6 = XXL 15" - 16" (38 - 41 cm) XXL Measurement taken at circumference from the base of the heel around the ankle, while wearing an athletic sock. References: 1. McGuine T.A., Brooks A. AM J Sports Med.2011 “The Effect of Lace-up Ankle Braces on Injury Rates in High School Football Players”