I'm 6ft 160 lbs with an athletic build and I purchased the medium sized long sleeve in white. After not having much luck with two different slim fit henley brands on Amazon, I didn't have high expectations with this brand. While it's not perfect, I'm surprisingly pleased with it overall. Here are my thoughts:Fit:Even at 160 lbs, the medium size is fairly tight but not too tight where it feels uncomfortable or feels like it's going to rip. It is a bit tight in the arms although it does show off your muscles which is nice. Despite the tightness, it doesn't feel restrictive when I try to move my arms.Length:This is my biggest issue with the shirt. It is a bit on the shorter side which gets annoying if you put your arms overhead to reach for things. It's not a dealbreaker though as the length still goes below my waist so as long as you're not constantly reaching overhead, you'll be fine.Quality:Quality is good for the most part. The fabric feels comfortable and sturdy. The buttons are a little annoying to put on but it's not to bad.Overall, this is worth considering if you're looking for a slim fit henley shirt. This is likely a keeper for me but I might consider exchanging this for a large size.Great shirt for the price. Runs a bit large,but not overly large. Soft & comfy and looks well made.My husband is 6'2" 190# he's athletic built. US size he always wears XL. This shirt I had to size up. Its pretty slim and not as long in the torso. Material is soft and thick not see through but overall wouldn't purchase again do to the shirts length being shorter.I purchased a few of these and I'm pretty slim with long arms so I went up to a large and they fit comfortably so I recommend going a size up. I usually get medium but with this slim style they fit pretty tight!As ExpectedI’m 5’11” 190lbs and an athletic build. Fits perfect. Not too tight, not too loose. I love thermals and th waffle pattern. Great product.I had received one earlier as a gift so I knew what to expect.I have about two dozen henley shirts purchased from Target, The Gap and other vendors on Amazon. This is the only henley to fit me very poorly. It's not an issue of size, but the way the garment is cut. When I wear it the buttons hang forward, away from my body with the neckline hanging lower than other henleys-- almost as if to make room for showing cleavage. Perhaps it's a woman's henley labelled as a mans? I don't know, but can only say it's a very poor fit for a man.