This vest is a great product. On some unseasonly warm winter days with heavy winds, I'll dawn this over a short sleeve jersey and be absolutely fine (about 50*F with 25 MPH wind). I'm 5' 9", 148 pounds distance runner build. The small is a good fit in the chest, but the arm holes are a tad to big. The tall neck collar is great. The zipper will occasionally not go all the way to the top, which can be bothersome. This is my first wind vest, so I can't say I have much experience with others. I can say, I'm very pleased with this purchase. It's proved its use so far. I purchased the screaming yellow/black for visibility. It certainly is bright. I wear it on my commutes at night.