The Sidas 3FeetĀ® Eco Winter Mid Insoles are anatomically and ecologically designed for snowboarding with a medium arch, keeping you supported and warm while you shred. The insole incorporates an EVA shell for stability and support, which is ideal for optimizing your body alignment and control in your boots. A woven polyester mesh cover and partially recycled Evamic Insulated foam provide durable thermal insulation, so your feet stay protected from the cold while reducing the product's carbon footprint.