It's just a tee shirt. Luckily, all you need is a tee shirt.
Arc'teryx Eon SLW Crew Base Layer Series are made with the soft and odour resistant MAPP Merino wool. Lightweight and ideal for active and extended use, provides thermal efficiency because of rapid dry time.
Arcteryx Chimera Shirt LS is a two fabric made combat shirt. Tweave durastretch and the lighter cyberknit make comfortable under armour, web gear and pack item.