Trew Size Chart At this point, you're well versed in the benefits of merino wool: thermo-regulating, moisture-wicking, odor-stopping, and so forth. Trew's new Weightless NuYarn(R) Merino Wool T will delight those of you who thought wool couldn't really be a year-round fabric. This is the versatility of wool on display-superlight, ultra-soft, and ready for summer activities like running, hiking, climbing, and biking. It works better than synthetics at keeping you fresh and cool, and NuYarn(R) nylon-core merino thread technology makes it as strong as it is soft. Is it truly weightless? Maybe not precisely, but despite the fact Trew's designers weren't able to reverse the laws of physics, you're sure to find the Weightless T amazingly airy and comfortable...to the point you might question its non-weightlessness. Features: - 105 Weightless NuYarn Merino - Laser-cut PU logos - Heat-welded interior label - Flat lock seams stretch and lie flat against the skin - Designed for everyday outdoor adventures - Slightly longer and slimmer than traditional t-shirt - Articulated back arm and side seams - Scooped hem - 125 Superfine NuYarn(R) Merino: 17.5 micron fine merino fibers, 85% merino wool / 15% nylon