I'm 5'9 and 180lbs and the large fits perfectly. Exactly what I was looking for in this shirt jacket. Good insulation, nice fit (not too much room, but not tight) and rugged to last. Very happy.

Cozy, warm and light! My boyfriend loves it! I got him a Medium then returned it to get a Large. For reference he's 5'10 athlete build 205 lbs. And the Large was perfect!

Love this shirt jac. Great Fit and awesome quality. I and going to buy 2 more in different colors.

6'6" 200lbs and it fits quite nicely, not so loose and flappy.

This shirt is like therapy! Love the soft fleece lining. Super warm and comfortable and fits really well.

Great fit. Warm and comfortable.

A real comfortable in-door lounging shirt and a warm outdoor cool weather jacket. I wear it all the time...Really like it.

Great fitting flannel shirt, high quality.

I'm a tall lanky guy 6' 145#. I got a medium, would like to try a large to fit the shoulders and arms better. Only concern is a large would be too baggy in the mid section, which I like to keep a trim fit. Seems a bit tight across the shoulders (no stretch to the material). As others wrote the forearms do fit a bit tight (and I'm no muscle man). Overall length is good, but man the tight shoulder area and slightly short sleeves are making me not like this as much as I want to...because otherwise its an awesome shirt...and oh so cozy with that sherpa lining. Kuhl...please keep us tall thin guys in mind when designing shirts because I really want to like you too!

True to fit, my husband is 6'1" 175lb and the medium is just right. He already had one he has worn over and over and I knew this would be a great gift! He would wear it daily in the winter if he could.