These authentic sheepskin boots contain a removable, replaceable upper that is naturally thermostatic, keeping bare feet dry and comfortable in extremely high and low temperatures by wicking away moisture and allowing air to circulate. Fleece footbed forms to foot, providing a snug, comfortable fit. Triple-layer EVA insole with natural foot-warming mechanism keeps feet warm and comfortable. Multi-surfaced lug rubber outsole with heel cushioning insert provides traction, support and additional comfort. Designed to be worn barefoot to maximize benefits of sheepskin.