I bought this as a baselayer for 3 seasons and for a 3 day trip in the Sawtooths in August. I liked the fit and it kept me warm enough by itself in August in the Sawtooths (low 40s at night). The problem came when I returned home and discover that the stitching on the front of the neck was coming undone. I had only used it for 3 days and in no way was rough on it. I took it back to the store I purchased it at and they exchanged it no questions asked. I've now used my new one as a baselayer for mtn biking this winter and have noticed the armpit stitching on one side is also fraying. I had hoped that I had just gotten a lemon the first time and would have no issues but now I'm not so sure. I give it 3 stars because the fit and warmth is awesome, but the fact the stitching keeps coming undone after minimal use is a big issue.