I got one of these thinking it would keep me warm when my wife and/or the kid keep the covers for themselves (those little ones creep into bed while we are sleeping like little ninjas). Well, it does keep me warm, except the back of my neck for some reason (more like below my neck line). Unfortunately, they are not comfortable. I bought a large. I am about 5'11" and weigh in at 196 lbs. My shoe size is a size 11.5. The feet are poorly put together and very uncomfortable. The buttom of the footy is not the same material and not soft at all. There is so much excess material inside that my feet were really bothered by it. Also, the amount of static electricity this thing creates is amazing. I suspect if I were to actually drag my feet, get into bed, and accidently touch my wife (before discharging) I would give her a good little zap. It actually crackles when I used to put it on. After several washes it did not shrink (and even using a couple of sheets of Bounce this thing could still light up a Christmas tree). The flap on the back is great for getting hung up on door knobs, though to it's credit, no tears. I don't see the reason for the flap, as it is ill placed and would likely cause more of a mess than if you just took the entire thing off. For that matter, the lowest button is a bit high, so, how can I say this, I have to go over and then out (and I do not have short legs) in order to go, and it's not very comfortable. All in all, I would try a different manufacturer and probably a different material.