icebreaker longsleeve 190g is 10oz in Large...I've used this in 50-70 deg temps/and for sleeping. It's very comfortable, and great at regulating heat. Doesn't stink even after 3 days of my heavy sweat...p.s. there is no top stitching going over the shoulder, so it's meant to be comfortable w/ a pack--
I also bought a stack of icebreaker crew short sleeve's and smartwool short sleeve t's. smartwool is a better deal on the crew t's but--icebreaker has more style (2-tone)-so up to you..
the crew t's come in at about 7oz-capilene clothing is about 2oz lighter, but after 10 years--I'm going to have to say the new OLD school of wool products is much better -- stink factor and comfort (think soft cotton t) wins it..
I've found the icebreaker 190g/200g and smartwool shirts are comfortable in cool and hot georgia weather...I think the heavier knit products would be for mountaineering, skiing, cold weather prospects.
My wife has a whole set of wool tops--her favorite phrase, "don't be jealous of my icebreakers." then i found a sale at high country-- 40%off..she's the jealous one now...
--our layering system includes-- one smartwool shortsleeve crew, one icebreaker long-sleeve crew, capilene bottoms, patagonia houdini windtop and windpants, pata micropuff vest, pata specter WP pullover, golite umbrella.