The Aetrex Orthotic System is Built-In to every pair: Our insole features arch support that helps to stabilize your body, align your feet, and relieve common foot pain (including plantar fasciitis, heel pain & arch pain). Our insole features UltraSky™ cushioning to provide pressure relief & superior comfort. Our insole is lined with microfiber treated with antimicrobial technology to help fight everyday odors. Details: Adjustability: Hook & loop strap for personalized fit Upper Material: Quilted plush fabric for cozy warmth Lining Material: Soft, breathable fabric to prevent overheating Outsole Material: Rubber for stability and traction on indoor and outdoor surfaces Removable Insole: No Heel Height: 1.13"