UGG Scuff Sis Slippers Keep your feet cosy and in style with UGG's Scuff Sis Slipper. This slip on style boasts the brand's signature natural wool interior and plush Esperanza sheepskin collar. Designed with a suede outer and a tonal molded rubber outsole, the classic slippers features a classic solid colour throughout and embossed Ugg detailing to the sides for instant brand recognition.