Fully waterproof, seam-sealed lace up boot. 17 mm UGG pure wool liningCold weather rated to -20 °CeVent waterproof bootie constructionExclusive Vibram outsole and a repeating lug tread pattern that provides maximum surface contact for traction and malleability at the foot’s natural flex pointsNon-wicking nylon laceDescriptionRemovable and replaceable UGGpure insole that keeps feet dry and cozy. Exclusive vibram outsole and a repeating lug tread pattern that provides maximum surface contact for traction and malleability at the footbed natural flex points.