Really dig the duofold line. I wear the long underwear everyday almost. The compression and warmth keep my legs up. This shirt is the exact thing for the upper body. Fits my 6'2 180 frame nice and snug in L. Arms slightly short, maybe another inch would be perect. As any non-suctom shirt its tight in chest and arms but thats what I wanted in a L.  Also its warm as heck. This shirt and a rain layer will probably be good down to about 45 degrees if you have the long underwear and good socks on and of course any fabric pant.