Get ready to own the world’s most comfortable socks. Your feet will thank you and so will the planet! Each pair is made from four recycled plastic bottles. It just so happens polyester from recycled plastic makes AMAZING SOCKS. Not only are they extremely comfortable and long-lasting, but they stretch to perfectly conform to almost anyone’s feet! All socks are manufactured in the U.S. with recycled plastic sourced from the U.S. and ship in recycled mailers made from 100% recycled materials.