I have two like-new Aircast Walking Braces. Both are "XP Walker Extra Pneumatic." The price is for one, not both.
One is a large which fits men's shoe size 10-13, and women's shoe size 11-15.
The other boot is a medium. That's men's size 7-10, and women's 8-11.
Both boots come with the hand pump and stockings. They're used; but I am in a wheelchair full time, so they were never walked in.