UGG Women's Tularosa Route Detachable Boot Sheepskin Part of the Classic Collection. Shaft height is 20 in. extended & 12 in. cuffed. Upper is 17 mm Grade A Twinface sheepskin with 100% Merino wool detachable cuff. Cushy foam insole adds extra comfort. Sheepskin sock lining naturally retains heat and wicks away moisture.