Hi, im trying to figure out what size to buy, medium or small. I am 5'10, 165, athletic build. I like my jacket to fit slim, not baggy. How baggy is the alpha sv? Thanks!

Got a medium candy apple red and it fits like a glove. Thanks for the help fellas!

Hey I am your exact size and I have the Medium. It fits great and like cash and brandon said there is room to layer. If you went with the small there would not be enough room to wear a fleece under it. Go with the medium. Hope this helps!

I am 5'8" and 165lb. My chest is 40". I wear a medium and have enough room to put a softshell or 200 fleece underneath. It all depends on your chest size. Keep in mind that if you go with small, the jacket will be a little shorter too, and for your height, that would not give you enough coverage on your behind. The fit on the alpha sv is loose, but would not be considered baggy. It actually fits the body very well despite the fact that it has room for layering. I don't have a super muscular build, but when I wear it, it does make it seem like I do! I have tried on the small in the alpha, and it's definitely tighter, but not practical for layering. In general, you do want some room to layer under a shell, because it's not going to keep you warm.

Dizzle, go medium. It will fit you perfectly, and have room for some layering, too.

I'm 6'4, 180, tall and lanky and have the Large in the Beta AR and it fits slightly baggy. From what I remember, this tends to be a tighter cut because its a more specific use. I'd say if you wanted to layer anything, the medium would be good, but you might be able to get away with the small as well.