Description of Icebreaker BodyFit 150 Atlas Top - Long-Sleeve - Men's:
Wear the Icebreaker Men's BodyFit150 Atlas T-Shirt for traveling the globe, going for a hike, or hitting up the local climbing gym for a quick bouldering session. The slim-fit cut frames your silhouette and keeps the material close to your body, which helps the ultrafine merino wool wick sweat away from your skin. The natural thermoregulation properties of the wool keep you cool climbing or hiking during the day and provide warmth when you're hanging out around the campfire at night. Icebreaker gave the Atlas T-Shirt and underarm gusset for increased comfort and range of motion.
Bottom Line: Whether your adventure is a three hour trail run or bar hopping through Vancouver, the Atlas T-Shirt performs.
This shirt is great for working out, layering under a jacket in cool weather, or for lounging around the house. Icebreaker materials are far and away above and beyond anything else in its class. No stink, keeps you warm when it's wet, and you can wear it days on end without scaring yourself. Great lightweight shirt that is versatile.
We discovered Ice Breaker when we hiked Milford and Routburn in New Zealand. Better designs and better made than Smartwool. Great for all weather except Texas summers. I am now on the Tibetan Plateau 4000 meters+ in November and had these on under my fleece and shell.
Quality is second to none as you would expect from Icebreaker. Great all-season weight and softness as well. However, make sure you really pay attention to the sizing chart. I am 6'3", a very athletic 200lbs and generally wear an XL in just about everything, except this... the XL is too tight in the chest a little on the short side as well, and yes I know this is a base layer and should be snug.
My advice is to pay close attention to the sizing chart (duh) and order based primarily on chest size and then height.
Update, the XXL is a perfect fit.