Thank a healthcare worker like a doctor, nurse or caregiver by buying a pair of these unique socks with a red heart on the back of each leg and a black heartbeat line that goes all around the sock. For each pair purchased, SockGuy will give a pair to a worker at a hospital or healthcare facility! These cool socks offer extra ventilation and a light compression fit to fight lower leg fatigue. They are made from SockGuy's Elite Performance Formula, a blend of polypropylene, nylon and spandex. Size S/M fits women's U.S. shoe sizes 6 to 10 or men's shoe sizes 5 to 9, while size L/XL fits men's U.S. shoe sizes 9 to 13 or women's shoe sizes 10 to 14. Made in the USA.