60% Synthetic Leather, 30% TPU, 10% Rubber Duratac: Proprietary grip compound provides perfect blend of grip and durability Range & Half Sizes: Size range, 8-14. Half sizes 9.5, 10.5, 11.5 Forged Metal Buckles: New patented 4-buckle system provides a durable, secure closure and perfect fit Hinge Lockout: Hinge lockout stops motion before hyperextension, supports forward and back movement, and gives lateral support around the ankle Insole: Composite nylon-fiberglass insole board with anti-shock pad at the heel supplies impact resistance, stability, and support on the pegs