When you lift this thing, it is *Heavy*. Almost as heavy as a sopping-wet normal hoodie.  It is immediately obvious that this is not your normal hoodie.  It keeps you toasty warm when you are outside, but is still comfortable to wear indoors (if you keep your castle cool).  I bought one of these for each of my boys after purchasing my own in a brick & mortar store.  None of ours have shrunk, though we do wash them in cold water and hang-dry.  Even as heavy as they are, they hang dry in less than a day.  The sizes run true - I stand 5' 10" tall, weigh 180 lbs (33" waist, 42"-44" chest.  My LARGE fits perfectly.  My boys are 4-5 inches taller than I and a bit slimmer.  Their X-Larges fit them beautifully.  I'm serious when I say that it will take less than a minute before this becomes your favorite hoodie ever.  :)

I looked at other reviews here, and found it odd that so many people complain of this thing running small. As I mentioned, I don't use the dryer to dry it, though after it is completely dry I put it in the dryer to soften it up.  I will say that when putting it on and taking it off, it does feel tight.  It doesn't 'give' as much as normal sweatshirt material does.  I also don't wash it every time I wear it since it is a hoodie and protected (underneath) from sweat and odor by at least two layers. I suppose if you are the least bit claustrophobic, or if the flexibility of your shoulders etc. are not great, you might want to buy it a size larger than would normally be your wont.