These run pretty large. My boyfriend is skinny but 6' so I thought I should buy him a large but it turned out to be too big (widthwise and also height!) He has very long legs and arms so I thought the large would accomodate that but it was still pretty big. Same with the womens' version. So probably your best bet for fit is to size down. Otherwise, it's an awesome item. Comfy and warm-- good for cold weather general long underwear usage as well as snowboarding.