The uniquely developed "C-shaped stopper," which was created through research on foot movement and fabric elasticity, firmly holds the heel. The inside of the socks has a size print. "How to Use" - "Materials" Cotton, Polyester, Others "Precautions for Use" ・Discontinue use if you notice any skin abnormalities. Okamoto Corporation *We will use simple packaging. Thank you for your understanding. The price includes shipping.