All the elements are in place to keep your feet warm, dry and comfortable. The Cold Weather Collection contains Vibram and eVent components. Uppers: All boots are made with waterproof full grain leather or water resistant textile uppers. Insoles: Removable and replaceable 17mm UGGpure sock liner that naturally wicks away moisture and helps keep your feet dry. Breathable eVent Membrane. Outsole: Exclusive Vibram outsole designed specifically for Ugg Australia utlilizing the TC1 wet/snow compound. Repeating lug pattern maximizes surface contact and provides flexibility at the foot’s natural flex points. This boot features a leather bottom shaft with cuffed twinface top shaft. Shaft is about 7 inches tall.