Made of foam latex covered with felt, these insoles provide insulation to help prevent hypothermia. They also help to prevent chafing of the skin on the feet and the formation of calluses and corns. The MAVI STEP Filc insoles are quick to absorb and remove sweat, making them a great choice for wearing in winter shoes without an insulated lining. On the reverse side of the MAVI STEP Filc insoles, you'll find a drawing that you can use to cut out the size you need. These insoles are available in sizes 35-46, so you can find the perfect fit for your feet. To care for your MAVI STEP Filc insoles, simply dry them daily at room temperature, away from heating devices and direct sunlight. With proper care, these insoles will provide warm and comfortable feet all winter long.