I prefer a baselayer that fits tightly rather than one that fits loosely. I'm 6'1" 165lbs and a Large fits right on length to the waist and to the arms, but is fairly baggy around my body. It is a little light for wearing during the winter under a coat, but is perfect during the summer while hiking. The zipper is nice to vent heat. Like the previous review I agree about the price. This packs down pretty small and is light for how warm it is. I am overall pleased with the layer, but would get a tighter fitting base layer next time.

The fit is perfect (I'm 6'2", 200lbs) with an XL, which provides plenty of length in the back and the sleeves. When I first felt the material it seemed lighter/thinner than I expected but it was surprisingly warm for its weight. I've worn it as a base layer for both mountaineering/backpacking and skiing. The Pros: extremely comfortable (both the cut and seam position), well constructional, I like the zipper for heat regulation, it's great for packing and dries quickly. The product does exactly what it's designed to do and works well for a wide range of temperatures. Cons: Some individuals may prefer a heavier base layer for severe cold conditions but I'd rather add another layer. It's a little pricy, but you get what you pay for.