SUPER.NATURAL provides functional long underwear that will keep you warm on cold days in the mountains.  Men's TUNDRA175 Long Underwear utilizes flatlock stitching and a flexible waistband to provide a comfortable fit.  Thanks to the odor-resistant property of the SUPER.NATURAL Merino-Mix, you can wear this layer day in, day out. With its weight of 175g, the midweight fiber offers a pleasantly light feel and allows unrestricted freedom of movement.