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