Extra-Roomy
 Diabetic socks
Great for people with Edema. Fits up to a 24 inch calf.
Unisex sizing:
SM: Mens 5-8, Womens 6-9.
MD: Mens 8.5-11.5, Womens 9.5-12.5
LG: Mens 12-15 
Womens 13+