As far as comfort and weight, yea good product, however the longsleeve tended to yank upwards alot and id have to readjust the whole shirt to avoid a baggy mess on the neck and shoulders and have a pile up at the stomach region. (that may just be from the fibers of the shirt not being broken in yet.) Runs bigger than to my expectation, left with alot of bagginess at wrists and legs. If your looking for a super tight fit you probably wont find it here considering all body types are different, Im 5 foot 7 weigh 140 pounds, relatively muscular and I ordered a medium. Cant say for certain but if your my height you should go with a small. You may find better useage as backpacking underlayers but to work out in it might be frusturating. Overall very comfortable. Breatheable for sure.