Allbirds Men's Tree Runner Shoes Sol/White M10Lightweight and breathable eucalyptus tree fiber is responsibly sourced from FSC® Certified forests to provide a comfortable knit upperShoelaces made from 100% post-consumer polyester thanks to recycled plastic bottlesPerfect shoes for everyday wear in warmer weatherBio-based TPU eyeletsIN-SHOE COMFORT:SweetFoam® midsole made with sugarcane-based green EVA for a contoured and bouncy stepCastor bean oil and ZQ Merino wool combine for a cushioned, moisture wicking, and odor reducing insole foamZQ merino wool heel lining provides comfort around your heel and ankles