I got it primarily to wear under an outer vest. I received the navy blue which goes very well with my navy blue tote. I'm 6'2" with a 44" chest and 35" sleeves. Got a large and it fits great. In military sizing I'm Big Long. Although I wear XL with a lot of brands. . If I use thumb loops, they will sometimes too tight when riding. But you can just drop them. Arms are at your sides or usual movement seems fine. Keeps the wind out well. One guy mentioned fabric on the sides that lets the wind through Well, under my vest that's not a problem. But I wore it without a vest and didn't notice. I think if it's really spanking and/or you're just wearing a t-shirt underneath. But I'm thinking more of a durable base layer or a really warm shirt than on a jacket. It hasn't rained since I got it but it looks like it will be quite waterproof. In general I like it. Especially for the price. Maybe I'll get am End another one in a different color for hiking and like that. Because it is not worn under a vest, but as an outer layer, I can choose size XL.