The eco-designed anatomical ski boot insole tailored to your foot type. Sidas has developed the 3Feet concept, which tailors the way the insole is constructed to the 3 different foot-arch types. The 3Feet Eco Warm Mid insole is designed specifically for medium-arched feet. The EVA shell provides stability and foot support. The recycled polyester felt top layer, paired with the Evamic Insulated foam, provides warmth and thermal insulation. This insole has also been shaped to fit easily inside your ski boot. It features an “eco-conscious” design, using materials selected to reduce its carbon footprint while maintaining the comfort, warmth and support you have come to expect from Sidas. This insole’s carbon footprint is X kg of CO2.