Silipos Wonderzorb Molded, soft biochemical-grade silicone. Won't dry or bottom out. Breathable, hypoallergenic, nontoxic, nonflammable, odorless and washable. Use in dress or athletic shoes. Does not get warmer than body temperature. Choose from two models each designed to address specific trouble spots for great support and shock absorption. Wonder-Sport Relief of pressure and shock Elongated metatarsals Metatarsalgia Bursitis