I've had a few pairs of Icebreaker leggings before, but this was the first baselayer crew that I bought. Needless to say, the long-sleeve is extremely comfortable for any sort of wool product, while still maintaining that classic breathability. It's great to wear under a shell to class or on a day out on the slopes. I'm 6'2", 175lbs and chose to get the large because I like my baselayers close-fit, but not skin-tight. If I did I could easily go for the medium and likely still have some breathing room. Overall a great product. I highly recommend it!