The Pythagoras bootie is made with fluor-free water-repellent recycled cotton fabric (no waterproof) and high-quality organic cotton (fake wool) lining, which keeps your feet warm and protects you from the rain. The removable ergonomic recycled PU insole and the outsole sewn only to the upper give maximum flexibility, comfort and recyclability to this timeless winter model, handmade to order in our own workshop from Elche (Spain).