Cashmere Silk Ribbed Knit Men Thermal Pant Long Johns Bottom Solid Size S M L XL Made from 70% natural silk,15% cashmere and 15% nylon Natural silk blend fabric wicks moisture away from the body and keep sensitive skin protectet Thicker than common cotton bottom, warm in cold day Ribbed Knit fabric looks smaller than plain knit fabric,more stetchy and better to keep warm Hand Wash preferred,Machine wash cold, gentle cycle, No Alkaline,No bleach, Dry flat