warmth and athletic style. the nike ya big logo (3-36 months) infants' set includes a cosy hoodie and trousers made with a warm cotton blend and elastic trim for a snug fit. a bold graphic delivers athletic style.. benefits. lined hood for warmth and coverage. full zip for versatility and easy on and off. elastic cuffs and hem for a snug, comfortable fit. elastic waist and hem on trousers for a snug fit. product details. screen print at front for style. fabric: hood lining: 100% cotton. hoodie/trousers: 82% cotton/14% polyester/4% elastane.. machine wash.