Design: FSC-certified TENCEL(TM) Lyocell (eucalyptus tree fiber) upper Bio-based nylon eyelets Shoe laces made from recycled plastic bottles ZQ merino wool heel lining Angular heel shape softens impact In-Shoe Comfort: Seamless one-piece upper provides maximum comfort Lightly padded heel and collar locks ankle in place Castor bean oil-based insole foam SweetFoam(R) midsole made with sugarcane based green EVA offers flexibility and cushioning for a smoother ride Durability & Traction: FSC-certified natural rubber outsole Additional Details: Weight: 10.3 oz Heel Drop: 7 mm (Forefoot: 15.5 mm; Heel: 22.5 mm) Carbon Footprint: 10.7 kg CO2e Care Guide: Pull out insoles and laces, slip shoes into a delicates bag, and toss into washing machine - gentle cycle with cold water with your favorite mild detergent. Shake off any excess water and air dry.