This trail-worthy tech tee offers exceptional athletic performance and comfort. Our unique fabric blend features superfine Merino wool fibers ringspun around a nylon core, combining all the natural benefits of wool with the softness, durability, and stretch of synthetics. The Apex Merino Tech Tee features 18. 5-micron Merino-Wool, which is ring-spun around a nylon core; the result, washable durability with all the moisture-wicking, anti-stink benefits of Merino Wool.