Boys Batman Onesie. He is vengeance, he is the night, he is the coziest one in Gotham City in this awesome onesie! This awesome black onesie is crafted from fuzzy polyester to keep crime-fighters warm and cozy! Featuring the signature appliqué Batman logo on the front, the all-in-one is completed by a lined hood showcasing Batman's ears and eyes. With an embroidered 'Batman' on the back, this onesie is perfect for any dark knight!