UGG Women's Kristin Winter Boot 100% Cow Suede, Sheepskin Dyed sheep fur (Fur Origin: Australia, Ireland, the United Kingdom, or the United States) Rubber sole Shaft measures approximately 5.5" from arch Heel measures approximately 1.75" Platform measures approximately 0.5 inches Boot opening measures approximately 11" around Water resistant suede upper Treadlite by UGG outsole for cushion, traction and comfort Lined with sheepskin UGGpure wool insole with added arch support Designed to be worn with bare feet, but if you would prefer to wear it with socks, consider ordering a half size up