Wool is all of those things, and I’ve come to believe that at least one wool technical t-shirt needs to be in everyone’s wardrobe. That’s why most wool tees, whether short- or long-sleeve, are blended with synthetics. You certainly can avoid petroleum-based fabrics and wear 100 percent wool tees, but they are the exception rather than the rule. Beringia makes a top just like that, the Diomede Merino Wool Long Sleeve Crew, except it’s 89 percent wool—and not only is it wool, it’s made of the softest wool of any shirts we tested. The merino wool is just 16.5 microns—buttery—and the mesh front and back shed sweat rapidly.