Ride around in style and comfort wearing the UGG Niels Biker Boot. This water-resistant boot features a PORON foam insole lined with UGGpure wool that offers impact absorption, dryness, and warmth. Cushioned PORON insole lined with 5mm curly UGGpure wool 7mm curly sheepskin lining Molded rubber outsole with 3mm leather welt Water-resistant upper Medial zipper for easy on and off.