Rubber sole Fabric upper GreenStride comfort sole made of 75% renewable materials, including sugar cane and responsible natural rubber ReBOTL fabric lining containing at least 50% recycled plastic Synthetic toe guard Synthetic toe guard The look alone of the GreenStride soles on the Greeenstride Motion 6 boot from Timberland says "comfort." The design is inspired by rows of growing sugar cane. There's a reason for that. They're made with a 75% blend of renewable sugar cane and rubber from trees. They're packed with other great stuff too, including ReBOTL fabric containing at least 50% recycled plastic, and tons of performance.