Okamoto Nugenai Cocopita Ultra-Low Cut Black, 1 pair, and Low Cut Black, 1 pair, 23cm-25cm The unique "U-shaped stopper," developed through research on foot movement and fabric elasticity, firmly holds the heel. Size printed on the inside of the socks. "Ingredients" Cotton, Polyester, Others "Precautions for Use" ・Discontinue use if you experience any skin abnormalities.