Why did we name this stretchable 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