leatherTWX upper with 4" shaft. leatherTWX material utilizes 80% recycled leather that would otherwise end up in landfills; Nylon laces; Waterproof lining; Leather heel loop; Blend85 footbed. Blend85 footbeds are made with 85% recycled foam; Footbeds also feature ecoTWEED Lining. ecoTWEED material is made from recycled plastic bottles; Three-quarter length composite insole; Compression-molded EVA midsole; Oil and slip resistant rubber outsole