Got the windbreaker today and went out for a ride this afternoon. The jacket is generously sized for sure but I really don't mind that but I could have ordered a medium and it still would have fit ok. It was getting pretty cool on the way back and the breeze was from the north which naturally is the way we were headed. The jacket works as advertised it did a really good job of keeping the wind out and I was wearing cotton underneath. I opened the pit zips slightly and when we got home I wasn't drenched although the cotton t shirt was a bit damp in places but not too bad at all. so it looks like I got a winner.