I'm 5'11 and the extra large goes past my knees. I'll go as far as to say these are some of the best socks I've ever bought in my entire life
Pros
COMFORTABLE QUALITY CONSTRUCTION: Ergonomic cushioning and arch compression helps the sock stay in place and give the foot support during games or practice. Double welt top at the top of the sock ensures the sock stays up around the calf and doesn't slip down. Made with 66% Polypropylene, 25% Polyester, 7% Rubber, 2% Spandex for maximum durability and athletic performance.