I am 6' 165# 38-40" chest 34-35" sleeve,

I would like to wear a fleece (monkeyman) or sweater underneath,
but not much more. I think this jacket is warm enough to not need many layers?Does the MHW Sub Zero have relatively long arms? I want long enough sleeves but dont want too much space for cold air to enter under the jacket.
What size would fit best? M ? L?
How far down my hand should the sleeve fall when my arms are at my side?

Thanks,
Andrew

I really have to disagree with John and Ton. I'm 6'2 / 165lbs. I have a Sub Zero SL jacket size medium. The way that it sounds like you watn to wear the jacket, I think a medium would be the right call. With my Monkey Man jacket on over a merino wool baselayer, the Sub Zero fits just fine. There is still room to put a Gore-Tex ProShell jacket on over the Monkey Man and under the Sub Zero, if you were really working on a serious alpine climb. The sleeve cuffs come to just above the base of my thumb, and there is a velcro tab to cinch the cuffs down if you want to. The hem comes to below the belt in front and lower in the back. The jacket is meant to wear short, since it is made to be compatible with climbing harnesses for high-altitude mountaineering. You can certainly go to a Large if you would prefer a lot of room for bulky layers or you want a serious (very cold conditions) belay/alpine jacket, but as far as the sleeves go a Medium will fit you fine. As far as warmth goes, a light fleece layer and a tee shirt under the Sub Zero jacket will probably take you to a couple of 10s of degrees below zero, if you are just bopping around town. There are a lot of feathers in this jacket and it cuts a big, down figure that traps a lot of air and heat. Hope that helps!

I'm 5'4 to 5'5 and weigh 165lbs to 170lbs and the medium fits me perfectly. As this is a short jacket, the medium would be way to short for your height. A large might still be too short so you should go for an XL unless your height is much more on your legs and not your back. Either way a medium is too short.

Andrew. I would go for a large. I am 5'9" and 155 and wear a medium. With a large, you should be able to layer easily underneath without leaving to much extra space for cold air. Cheers!