Origin Japan Product Description ① This night pressure sock cares for mothers' leg coldness and swelling through warmth and pressure on the ankle. ② The ankle part is made of far infrared material, warming the ankle like wearing warm leg socks. ③ Graduated pressure based on medical research promotes blood circulation and reduces swelling. ④ Strict quality control is conducted from yarn to transportation. ⑤ Moisture-proof material prevents dampness, allowing comfortable wear throughout all seasons. Function/Effect: Promotes circulation of venous blood and lymph in the lower limbs, reducing swelling. Pressure: Ankle 21 hPa / Calf 15 hPa Material: Nylon, Polyurethane, Polyester Country of Origin: Japan