Bought these boots because of the BOA system and fell in LOVE!!! These boots fit great with the help of the BOA system and the extra adjusting with the air pump. The air pump helps to reduce heel lift and make the boots fit even more snug. I like to wear mine tight and find myself turning the dial more as my feet adjust. (Remember that your feet tend to swell a half size as a day of riding goes on) so I find myself loosing and tightening throughout the day but with such ease and precision. Without having to replace I'm good to go in a flash.