Happy Heiny's offers a *contoured microterry insert to fit perfectly inside their one-size and sized pocket diapers.  You can easily double them (put 2 in the pocket of the diaper) for added absorbency and overnight use.

*The contoured inserts are gradually being changed over to be a straight-line insert (see picture below).  This change is taking place in order to continue bringing you quality products at an affordable price made in the USA.  Orders may be all contoured, all straight line, or a mixture of both until the switch is complete.  Thank you for your understanding!