Uncovered Small 1 Pair Dual Durometer For Medial-side Or Spur/fascia Relief And Maximum Comfort While Standing Walking Or Running Medium-durometer Silicone In Main Body Efficiently Absorbs Impact And Recovers Quickly Softer Silicone Blue Zone Area Provides Increased Comfort And Pain Relief 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