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 *optional Anti-microbial Cover Absorbs Odor Prevents Bacterial Growth And Allows Foot To Slide Easily Into The Shoe *retains Shape -- Will Not Deform Or Degrade With Use *washable And Reusable *1 Pair/package *covered Large