I like thin socks so these fit the bill.  I also like stretchy socks that fit comfortably over my calfs and these do that.  I find a lot of other ski socks do not stretch much at the opening, so it can be hard to fit them over my upper calf muscle (and no I don't have freakishly overdeveloped calf muscles).  I have no idea why other brands make them that way, but these stretch and are very comfortable.  Just for reference I have a size 13 wide foot, and find that the XL fits nicely.