100% Cotton. Celebrate the vibrant spirit of the Second City from day one with this colorful Baby Chicago The Windy City Gerber Onesie. This engaging design features a masterful collage of Chicago’s most famous landmarks and cultural icons, including the stunning Willis Tower skyline, the historic Chicago Theatre sign, the city's four-star flag, and an "L" train crossing a bridge. Your little one will also showcase local favorites with illustrations of a Chicago-style hot dog, a slice of deep-dish pizza, a powerful bull, and a jazz saxophone, all arranged around a bold "Chicago" banner. It features a convenient snap closure for quick and easy diaper changes, along with expandable lap shoulder necklines for effortless dressing. Whether it is for a baby shower gift or a special trip to the harbor, this Chicago-themed onesie is an instant hit for boys and girls alike.