From website: Sustainably sourced. Tree Runner is a lightweight everyday sneaker, made with responsibly sourced eucalyptus tree fiber. The Tree Runner has a carbon footprint of 4.52 kg CO2e. Learn more about carbon footprint labeling and our commitments to reduce our impact. Best For: Walking, warmer weather, everyday wear Thermoregulating: Lightweight, breathable eucalyptus fiber provides next-level comfort Sustainable Materials: FSC-certified TENCEL™ Lyocell (eucalyptus tree fiber) upper SweetFoam® midsole made with sugarcane-based green EVA Bio-based TPU eyelets Shoe laces made from recycled plastic bottles Castor bean oil-based insole foam ZQ merino wool heel lining Some models may include a wool-lined insole instead of the TENCEL™-lined insole featured in the image Where It’s Made: Vietnam. Learn m