Vigor golden yellowBuy Now The fabric used for this mid cut is a cotton linen blend. The high level of cotton (67% Cotonea Cotton) makes it especially robust and abrasion resistant, while the hemp flax fleece padding and soft flannel linen lining also keep our feet warm and dry on cooler days. No animal based materials are used in this model. Around 33% of the outer sole material is recycled, and the membrane is made of 100% polyester, 75% of which is recycled.