Knee length, 20-30mm Hg compression, individual poly bag with UPC code. These blue heart beat socks will be sure to make your heart skip a beat when you put them on! Featuring true echocardiogram lines, these nurse socks are the perfect accessory to your nursing apparel. What makes them unique is that a nurse will recognize that the rhythm is good at the top of the sock and then gets more dangerous as it goes down to become a flat line. A crowd favorite for our male customers! Size: Small/Medium-Fits women's shoes sizes 6-10 or men's shoe sizes 6-9 and calf circumference 9-15" Large/XLarge- Fits women's shoes sizes 8-13 or men's shoes sizes 10-13 and calf circumference 14-19" 75% Nylon, 23% Spandex, 2% Copper