The base of the boot is made from a flexible Polyurethane called Elastopan®, which is a 100 percent PVC-free and waterproof. It contains millions of tiny air bubbles and is 40 percent lighter than PVC or rubber and 2.5 times more insulating than normal PU boots. A high quality suede shaft is durable and provides an exclusive look that repels snow and wet weather. Inside, a fuzzy and warm wool blend liner provides extra insulation and is removable for fast drying. Elastic laces with a toggle make adjusting the fit simple and a high traction lug pattern works well in the snow.