These eco-friendly socks are made of fibers from sustainable sources and recycled materials like plastic bottles and corn. These materials work together to make highly breathable and wicking yarns perfect for these athletic stocks. The mesh over the top is coupled with raised ribs that allow air to flow over the top of your foot for superior ventilation. The memory knit construction helps the velocity sock hold its shape after extended use so it stays put and wont bunch up. Combine this with flat seam stitching and you'll almost forget what a blister feels like.