Silicone liner selection of U.S. imports of medical-grade silicone material platinum vulcanized from the process of the world's advanced five-layer composite deposition technology, each product is in the 100,000 purification workshop production. • Medical grade silicone, tin-free, non-toxic, non-irritating • Nylon fabrics are abrasion-resistant and antimicrobial • Micro-surface treatment for better skin contact • Multi-level firmness for comfort and durability • 3D molding to avoid the silicone case slipping out • Resistant to dyeing and washing