He will be be warm and dry in this 2 piece base layer set by 32 Degrees Weatherproof. Made to wick away moisture and regulate body temperature. The unique blend of yarns create a luxurious feel and is anti-static and anti-odor. 37% Acrylic, 34% Polyester, 25% Rayon and 4% Spandex. Machine wash cold. Sizing: XS - 4/5; S = 6/7; M = 8/10, L = 12/14. XL = 16/18. Weight (lbs): XS = 32-41, S = 42-59, M = 60-72, L = 73-99, XL = 100-125. Waist (inches): XS = 22, S = 23, M = 24, L = 25-26, XL = 27-28. Comes with two pairs of complimentary Little Hottie Hand Warmers.