Not a basic piece of the layering pie. Our base layers are as comfortable on a boot pack as they are worn to bed. Our lightest base layer, at 200gsm this luxuriously soft thermal top regulates temperature whatever the activity from sun to snow and stays stink free for days on end. The Signature Blend is even beloved by those with merino irritations making it an unrivalled on-skin layer. 4-way stretch, contoured panels, scoop bottom and anti-chafe flatlock stitching all works with your body for maximum performance.