Our baselayer bottoms are a combination of fine-micron Merino wool and a razor-thin layer of wicking fibers that keep you dry and comfortable. Featuring our DUAL SURFACE(TM) Precision Blended Wool, nothing in the apparel world comes close to this baselayer in terms of warmth, breathability, versatility, durability, and overall comfort. Athletic Fit. Made in the USA.DUAL SURFACE(TM) Precision-Blended Wool TechnologyFabric Weight: 185 g/m2