1Uses good materials, smooth and soft, wear-resistant and breathable, can keep your feet warm and comfortable 2The SBR and SEBS pad inside are of high elasticity, can absorb shock to protect foot heel to make you comfortable all the time. 3Solid stitching and smooth lines, won't make your feet uncomfortable even wearing it with bare feet. 4Adjustable hook & loop design, giving you soft and comfortable wearing experience. 5Can wear in socks or in shoes, suitable for all shoes and all uses such as running, cycling, etc. Features: 1. Uses good materials, smooth and soft, wear-resistant and breathable, can keep your feet warm and comfortable 2. The SBR and SEBS pad inside are of high elasticity, can absorb shock to protect foot heel to make you comfortable all the time. 3. Solid stitching and smooth lines, won't make your feet uncomfortable even wearing it with bare feet. 4. Adjustable hook & loop design, giving you soft and comfortable wearing experience. 5. Can wear in socks or in shoes, suitable for all shoes and all uses such as running, cycling, etc. Specifications: Condition: 100% Brand New Materials: OK Cloth, T Cloth, SBR, SEBS Pad Color: Black Optional Size: S, L Height: 4.5cm/1.77in(Approx.) Strap Width: 3.5cm/1.38in(Approx.) Thickness: 0.2cm/0.08in(Approx.) SEBS Thickness: 0.8cm/0.31in(Approx.) Size Length(cm/in) Width(cm/in) L 11.0/4.33 10.5/4.13 S 9.5/3.74 10.0/3.94 Package List: 1 * Pair of Heel Socks