“The size is just as you would expect & the heat is GREAT. Since I was buying from the open box sale, I sized up. I usually wear a medium shirt or sweater. If the fit is tighter, I wear a large. I figured since it was a jacket, I’d be putting it over sweaters and might need the larger size. I do wish I would have purchased a medium instead of a large. My suggestion is, don’t size up. The fit is just as you would expect. I still love the jacket & should have bought one as soon as I learned about them.”