Teko are one of the few companies in the world to get a 9/9 maximum eco-rating from GreenroomVoice, an independent body that audits the world's brands for their environmental credentials through materials sourcing and supply chain, energy policy and recycling in their office. It appears that Teko care about your feet as much as they care about the environment, the Teko Marathon Running Socks are made from a soft Polyamide with a full cushion covering the sole of the foot.