This base layer is one of the most featherlight wool layers I have ever worn. Made from Merino wool, the Merino Bliss Shirt will keep you dry and warm—two of the factors you want most in any outdoor sport. Merino wool actually pulls away vapor sweat from your body and gets rid of it before your shirt is soaking wet. This thin layer also traps vital core heat, keeping you comfortable for longer in the outdoors. The sleeves seemed to be too long for my build, and I am not a huge fan of thumbholes; but all the same, this base layer does its job and has a convenient chest pocket—big enough for anything from a cliff bar to a full sandwich.$79; stoicgear.com.