Surprisingly I've only ever pooped a couple times in ski boots. Absolutely miserable, as you can't get the right angle with your knees and legs. Plus, I usually like to tippy toe a little bit when sitting on the toilet which isn't possible with ski boots on. Not to mention its always 1,000,00,000 degrees in a ski lodge bathroom so you sweat your ass off while throwing one through the hoop. I usually hold it in if at all possible.