The Kinetic Merino 200 Zip-T Base Layer is a single jersey base layer that features a high heat-to-warmth ratio while the quarter-zip design and superior breathability allow for temperature regulation in any scenario. The naturally moisture-wicking and antimicrobial properties of the merino wool are paired with the added stretch of spandex to make it an ideal option for next-to-skin comfort and performance. 95% 18.5-micron merino wool, 5% spandex construction 200-gram fabric weight Single jersey fabric for exceptional breathability Naturally moisture-wicking & antimicrobial Flatlock seams for next-to-skin comfort Zip chest pocket for storage Quarter-zip neck for temperature regulation