Cool bright blue tracksuit for boys Boys summer fashion, Kids BOSS Baby Boys Blue Cotton Tracksuit Childrensalon Boys plain tracksuit set light blue Superbalist Sets Superbalist.com Mayoral Newborn Baby Boys Beige Cotton Tracksuit Set Childrensalon. Soft and comfortable tracksuit set designed for active little ones. Made from a premium blend of 97% cotton and 3% elastane, this two piece set offers breathability and gentle stretch for all day wear. The classic blue color pairs easily with other pieces in your baby's wardrobe. Perfect for playtime, casual outings, or relaxed days at home.