My Aunt Is Definitely Cooler Than My Dad pattern Baby Romper features the following :

95% cotton

Envelope neck design and 3 snaps down at the bottom for closure, making it easy access for changing your little ones diaper.

To ensure the utmost longevity and integrity of our infant infant, there are recommended care instructions to follow:

Never bleach it or get it dry-cleaned.

Avoid ironing directly on the design.