L. L. Bean Wicked Warm Underwear base layer Midweight underwear keeps heat in and moisture out. Adds a toasty layer of warmth under clothes or outerwear. Snaps on shoulder for easy entry. Center snap at leg opening is a different color for easier alignment while dressing/undressing. Imported. https://www.llbean.com/llb/shop/121129?page=kids-wicked-warm-underwear-one-piece-infants