These Strachan II snow boots are insulated and lined to ensure comfort and warmth. The adjustable touch fastening strap allows for the perfect fit. They feature a waterproof rubber shell outsole and a water-resistant textile upper. The boots also have a sherpa fleece collar and are thickly padded for a comfortable fit. It is recommended to go one size up for a comfortable fit. Upper: 60% Textile/Sherpa fleece, Lining: Fleece, Outsole: 40% Rubber.