leatherTWX™ upper featuring tooled leather pattern on vamp. leatherTWX™ material utilizes 80% recycled leather that would otherwise end up in landfills. Nylon laces. Also features elastic gore panels on the tongue that allow the shoe to be worn without laces. ecoTWEED™ Lining. ecoTWEED™ material is made from recycled plastic bottles. Blend85™ footbed. Blend85™ footbeds are made with 85% recycled foam. Footbeds also feature ecoTWEED™ Lining. ecoTWEED™ material is made from recycled plastic bottles. Rubber outsole integrated with blended rice husk. Blended rice husk is an agricultural by-product that is typically thrown away.