Medical compression socks, size M, 24hPa pressure to promote blood circulation. - Brand: ALCARE - Product Name: ANSILK-PRO J (Calf Stockings) - Size: M - Pressure: 24hPa (18mmHg) - Intended Use: Medical compression socks Thank you for viewing. I purchased these because I was told I would need them for surgery, but I ended up not using them and it seems I won't need them in the future, so I will pass them on to someone who needs them.