Lands’ End Women's Black Silk Interlock Long Underwear Leggings Pants - Size 1X Item #512201AG2 Holds in body heat, naturally wicks moisture Breathable to prevent overheating Light enough to layer under office attire Elastic waistband lies flat for a bulk-free fit under clothes 100% silk. Machine wash, delicate. Imported Warm by nature. Some days you just can’t shake the chill in the air. Whether you’re at home or at the office, silk longies add an extra layer of warmth. They’re super light so you won’t even realize you’re wearing them. A natural insulator, silk’s hollow fibers are the key to its warming power. Wonderfully soft, you’ll love the way it feels next to your skin.