The Emu Merrijig Boots pair old-school athletic details with a cozy shearling lining for a hip way to face the cold.- Suede upper- Boot with lace-up closure & genuine sheepskin lining- Man-made sole Emu boots are made with sheepskin because of it's natural ability to "breathe", which allows feet to stay dry & maintain a comfortable temperature. Sheepskin also molds to the shape of your feet for a custom fit with anatomical support.