The eco-designed anatomical ski boot insole tailored to your foot type. Sidas has developed the 3 Feet concept, which tailors the way the insole is constructed to the 3 different foot-arch types. The 3 Feet Eco Winter Mid insole is designed specifically for medium-arched feet. The EVA shell provides stability and foot support. The thin woven polyester mesh top layer, paired with our Evamic Insulated foam, provides thermal insulation, protecting your feet from the cold. 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. In terms of eco-consciousness, we�re doing better, but this is still around 1.75 kg of CO2. To help offset this, we are contributing to the regeneration of forest and other ecosystems by donating one euro for every insole sold to the Sidas World Foundation. Features: Low-arched feet: Sidas has developed the 3 Feet concept, which tailors the way the insole is constructed to the 3 different foot-arch types. The 3 Feet Eco Winter Low insole is designed specifically for low-arched feet. Body alignment: the EVA shell gives the foot stability and support. Thermal insulation: The fine polyester mesh top layer, paired with our 20%-recycled Evamic Insulated EVA foam, provides the thermal insulation you need to protect your feet from the cold. Construction: Anatomical insoles per type of arch Top cover: Polyester mesh EVA foam base partly recycled EVA shell Composition: Mesh Polyester EVA foam base 20% recycled EVA shell