Good for the soul and good for the soles. Perfect for Wall Street or the wilderness. The up-sourced materials found in our Souls have been given new life—to make yours more enjoyable. These inserts (re-purposed 100 % wool) naturally warm your feet in the winter and cool them in the summer, providing aeration with each movement of the foot. hand wash in mild soap and air-dry. Please note each pair is handmade, sized approximately to standard US men’s and women’s shoe sides and can be trimmed for a custom fit.