; An added layer of comfort on a chilly day. Thermal knit long underwear offers a lightweight feel with breathable properties. Elasticized waistband prevents digging-in. Long leg pant provides better temperature compensation. Perfect for layering, sleep, or lounge. Style #73412. 70% merino wool, 30% silk. Machine wash warm and hang dry. Imported. If you're not fully satisfied with your purchase, you are welcome to return any unworn, unwashed items in the original packaging with tags and if applicable, the protective adhesive strip intact. Note: Briefs, swimsuits and bikini bottoms should be tried on over underwear, without removing the protective adhesive strip. Returns that fail to adhere to these guidelines may be rejected.