Uncovered * Large 1 Pair * Dual Durometer For Maximum Comfort While Standing Walking Or Running * Medium-durometer Silicone In Main Body Efficiently Absorbs Impact And Recovers Quickly * Softer Silicone Blue Zone Under Heel Center Maximizes Shock Absorption And Comfort At Point Of Impact * Retains Shape - Will Not Deform Or Degrade With Use * Optional Anti-microbial Cover Absorbs Odor Prevents Bacterial Growth And Allows Foot And Insert To Slide Easily Into The Shoe * Washable And Reusable *