Merino wool upper. Merino wool is a durable and eco-friendly material made from Australian Merino sheep; Nylon laces; Elastic gore panels on the tongue 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; Molded rubber cupsole integrated with blended rice husk (Agricultural by-product that is typically thrown away)