ben wheeler wrote an answer about Stoic Merino Crew - Short-Sleeve - Men's on May 22, 2012
Eric - the merino used in the Stoic crew is spun from a 17.5 micron (superfine) wool fiber. There is no itch in this fine a quality of merino. This merino will definitely inhibit lingering effects of funk, but will also retain a fair amount of moisture during high-aerobic activities. I wore recently on a hike in very hot, humid Hong Kong and was comfortable, although my merino crew did not dry as quickly as some of my companions' lightweight synthetic layers.
Weight of the fabric is around 150gsm (grams/square meter).