Soft, waffle knit thermal union suit provides comfortable warmth to keep out the chill.X-Temp??? technology is designed to adapt to temperature and activity to keep you cool and dry for all day comfort.FreshIQ??? advanced odor protection technology attacks the odor-causing bacteria in clothing that causes clothing to smell ??? so now you can feel fresh all day.Sturdy seam construction for added strength and durability with smooth, flat no rub seams to prevent chafing.Ribbed cuffs. Offers a slim, fitted look so you can wear it alone or layer it under a shirt. Size up for a roomier fit.For all-over warmth, pair with our matching thermal crewneck.