Uppers are waterproof full grain leather. Holgate offers quilted polyurethane foam for extra padding and stability Insoles are removable for replacement. Outsole is Vibram designed for UGG and utilizes the TC1 wet/snow compound. Design provides flexibility at the natural flex point of the foot with superior traction. This boot is much lighter than it appears. This boot normally sells out before fall so pre-ordering is suggested. This boot runs true to size, size narrow to normal width go down and wide feet go up if half size.