UNDER ARMOUR. 1277784040. BOYS CHALLENGER KNIT PANTS. GREY. Loose-- Fuller cut for complete comfort. Durable knit fabric gives you the right warmth and still performs. Material wicks sweat and dries really fast. Woven overlays on calves. Side hand pockets. Covered elastic waistband with internal drawcord. 8 inch leg zips. 100 percent Polyester.