I like the feel and fit. Base layers are never as warm as advertised but with proper layering this one is as good as anything Iï¿½ve found. Assos is always very expensive but every piece Iï¿½ve owned has lasted several seasons.
Use primarily for cold season road and mountain/snow biking. It fits me like a second skin and is astonishingly warm. I like it so much I bought another. I do a lot of cold weather sports and have owned many brands/types of base layers - this one tops them all. I've only used it a half-dozen times but so far it seems like it'll last.
Very comfortable base layer that is very lightweight with a nice snug fit. I went with the Size II (on the box marked L/XL despite typically being a medium size in most Men's Clothing (Reviewer: 6'1" - 165 lbs; long torso; 31 inch waist). As others have stated it is very stretchy and smaller sizes would easily have stretched on snugly, but I was looking for an inner layer that would not creep up while I ride and run, and this skin layer rests down to about 1-2 inches below the top of my hip bone when not stretched down, which is exactly the fit I wanted. The printed on zipper is a tad odd as there is no zipper, but makes it easy to figure out front vs rear. Very good value when BTD has it on sale.
Assos is expensive. But, you're paying for quality. Treat their gear properly (wash warm/cool) and hang dry, and it will last for years and years. I rate it a good deal because it costs a lot more than other brands, but it will last twice as long (if not longer).
This base layer is exceptional. I've worn it under a long sleeve jersey when it's been in the mid 40's and been plenty comfortable (when out for a hard ride when I'm raising my core temp). I've worn it under a thicker long sleeve when it's been in the mid 30's and also was warm enough.
I'm 6' 5" & 200 pounds. The sleeves are long enough for my arms and torso with a bit of room to spare. The fit is like a second skin. It's easy to get on and off (stretchy material), but is neither constricting, nor does it seem to stretch out.
Watch out with the size chart ! I am 6'1"and measuring my chest I come out to size 0. Wrong, way to small. So had to exchange it for a size III. And that fits better. They run short these base layers. Also they are very stretchy. On the positive side it is an amazing material and it is my favorite undershirt. It does keep you warm and it feels just right on your skin.
This base layer worked well under a long sleeve jersey at 40 to mid 50 degrees. I might try it at 30s but I might add another layer - either a vest or a sleeveless undershirt. I'm 5'11" at 190 lbs. and size L fits comfortably well.