Thank you for shopping with Project571. All of our UCSB infant onesies and tees are made with 100% organic cotton grown without the use of toxic chemicals that can be harmful to your baby as well as the environment. We are proud to give people the option to choose organic over products made with conventional cotton. If you have any questions or concerns about our UCSB infant apparel please don't hesitate to Contact Us from the menu bar above. Thanks!