Frost baselayer is warm, light and incredibly soft wool baselayers for women, men and children. Made of 100% super fine, 18.5 micron merino wool. In other words, Super soft wool! The wool's have natural and wonderful properties thayt will keep you warm even if you get wet or sweaty. Frost is a thin inner layer that is used next to your skin. Dress in layers with Frost as an inner layer for good warmth.