UGG's Fluff You slippers are made from the label's snug UGGPlush™ wool-blend. Crowned with a ribbed strap, they have a sheepskin insole and a Treadlite by UGG™ outsole underfoot. They're decked with a webbing patch that's woven with signature lettering. Upper: UGGPlush™. Sole: Treadlite by UGG™.