NUNUNU Black Letters Collegien Slippers Nununu slippers are known for their comfort and style. These kicks for indoors and outdoors look and feel like socks, but their flexible, see-through soles are perforated and breathable, with non-slip spikes for lots of running around. The are stamped with an 'A' and 'Z' on each sock. 82% Cotton, 16% Polyamide, 2% Lycre. Machine Wash Cold.