Size 9. Great condition. Our Tree Runner has a carbon footprint of 4.99 kg CO2e. Learn more about carbon footprint labeling and our commitments to reduce our impact. As a carbon neutral business certified by Climate Neutral, we balance our emissions by funding high impact carbon projects. 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