Let the kids build snowmen in these warm boots with insulation that stops the cold, a waterproof thermal shell and rubber sole. Upper: Durable water- and wind-resistant PU-backed synthetic textile upper with adjustable strap. Removable 6 mm inner lining of recycled felt that can be washed. Midsole: 2.5 mm tied felt frost plug to keep warm around the little feet. Outer sole: injection molded waterproof thermal rubber.