The Sweet Wanderer fits pretty snug. I am usually a small/medium, and their s/m feels a bit tighter than most, plus they send extra padding to go UNDER the padding that's already in there so it doesn't feel all funky once you add to it. Got a good adjustment band thingy on it too. Anyway, it's really comfy-- kinda like a penthouse for your head.
It's a good day to be a duck....