Why did we name this stretchable, moisture-wicking 1/2-zip the 1.5? Because it's light enough to wear as a tee, but warm enough to be a light layer.; 5.6-ounce, 88/12 poly/spandex; Removable tag for comfort and relabeling; Invisible zipper; Coverstitch seams throughout; Open cuffs and hem; Thumbholes to keep hands warm