Jockey Men's Long Underwear Thermal Sport Long John 88% polyester/12% Lycra spandex. Machine wash and dry. Imported. Style 843801 Lycra&reg; spandex provides excellent stretch to the fabric for body hugging comfort microfiber fabric wicks moisture away from the body to naturally keep you warm and dry fashionable and functional flat lock seams provide greater comfort extra length shirt tail back to ensure no gap wamth protection