Japanese grading scale compression socks Features a rugged waveform design on foot Promotes blood circulation & lymphatic flow Improves leg swelling, relieves leg fatigue & prevents cramps Designed to be comfortable & relaxing Maximum pressure values: foot 34 hPa(28~34 hPa), calf 23 hPa(19～25 hPa) Made in Japan & approved by general medical equipment in Japan Perfect for home, work & going out Size details: S-M: Calf 32-38cm; Ankle 19-23cm; Foot length 22-24cm M-L: Calf 36-42cm; Ankle 21-25cm; Foot length 23-25cm