Ordered Medium for 160 pound, 5' 11" - to small - just fits to tight. Order a size larger if you want a more normal fitting shirt. Otherwise seems like a nice product. Returning it for a size larger.

This is an extremely thin and lightweight shirt (that does a good job blocking the sun). It breathes and wicks well. However, if you don't like skin-tight shirts then this one is not for you. It is "fitted" enough that even if you sized up it would still be pretty tight.

i bought the sleeveless version of this. it was a little short for me in an xxl - 6'4 230 - but otherwise not bad. it was SUPER light, almost too light to give any sort of compression, and thus basically just a really tight shirt. comfortable, but after about an hour of sweaty basketball, it started to chafe my nipples.

Nice t-shirt for running in really hot weather, or as a bottom baselayer in cold weather.

This is a thin soft comfortable shirt that is more like wearing sunscreen than a garment. I wanted a change of shirt and something to sleep in camping and it's super light and packs small. Being tight and light the shirt also moved like a second skin and did not bunch up while spinning around in my mummy bag. I plan on buying several.

I've worn this shirt on many long distance bike rides and it really does the trick. It's super light and breathes really well. It's a tighter fit than I'm used to, but it wicked better than any other piece I've used so far.

This shirt is very comfortable. The material is Very stretchy and they sleeves are cut so they do not bind. Whether I'm running or doing Yoga, I am quite pleased with it.
Fit is pretty true to size, but seem to be a bit shorter cut in length.