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