Signature Nuknuuk EVA outsole, designed for indoor/outdoor. 100% suede upper. 100% sheepskin lining. Easy slip-on style slipper Memory foam infused insole The sheepskin can offer a tighter fit at first. Please go up a size for a looser fit and for half sizes. . The sheepskin lining should initially provide a tight fit with your toes and forefoot feeling slightly confined. The lining will pack down and mold to the shape of your foot to provide a comfortable, custom fit.