Each 2-Step diaper comes standard with our regular BULLETPROOF Insert of matching size. If our Stay Dry BULLETPROOF Inserts are desired instead, be sure to add them by going to the Insert Upgrade page and place in your cart with your diaper order. Number of upgrades should not be greater than diapers ordered. Additional inserts may be ordered at regular price, but are found on the Insert Collection page. Remember: No Insert Upgrades for AIOs! A Liner comes with S, M, and L AIOs (not NBs).