The one piece you'll never take off throughout your expedition, this baselayer top is engineered with minimal seams and delivers targeted comfort for premier performance on alpine missions. 67% Nylon, 33% Polyester. Designed as a first layer for alpine endeavors. Engineered fabric and articulated patterning designed specifically for alpine comfort and mobility. Engineered nylon poly knit fabric provides zonal warmth and moisture management with minimal seaming. Merrow stitch construction provides a more accurate and reliable stitch while eliminating bulk and improving comfort. Integrated collar and draft flap for added comfort. Center back venting engineered into the garment without seams. Extra long front zipper for added venting knit zipper tape for added flexibility and comfort. Longer back for optimal layering. Length from Center Back: 24.5. Weight: 218 g 7.69 oz. Imported.