Our Limited Edition BURLEBO x WHATABURGER COLLECTION. Made from a blend of 90% polyester and 10% spandex, our Baby Zip Up features our best selling performance fabric, ensuring ultimate comfort and durability. With fold-over foot cuffs and mittens, these outfits are designed to keep your baby warm and snug in any weather. Each newborn set comes with a charming bonnet, adding an extra touch of sweetness to your baby's look.