Got for boyfriend and he says:
The material feels good, and it works nicely as sun cover as well as insulation. Used most for biking.

I have listed his measurements below.

i bought this for my father in law who just moved back to the frigid cold of PA. He wears this under everything! great fit and feel and provides that extra warmth he needs.

Gave this as a gift to my boyfriend (6'2", 155lbs, size M/S). He seems to like the feel and warmth of the base-layer so far and loves the thumb holes.

This product fits a little big but overall works great for layering under down jacket.

I bought as a gift, he said it is a very warm base layer, the added zipper is nice and helps cool you off a little when you get to hot.

Nice baselayer at a reasonable price. Does fit a little snug.

I recently went on a 3 day 2 night backpacking trip and wore this top under my puffy at night and early in the morning and as my outer during the warmer parts of the day. It did an amazing job at keeping me warm when it was cold and dry once I started sweating. I didn't bring gloves, which I was bummed about at first, but this has thumb holes which bring the sleeve up to my knuckles and kept my hands much warmer than without. It's a slim fitting shirt, which I prefer. It rides up a little bit when on the move but I guess all tops that are a little snug fitting would do that. Very happy with the purchase!