Measuring 12 inches x 15 inches, parents can fold the insert into thirds for six layers of rayon in the soaker zone. (earlymomentsmatter.org)
To make them night worthy, manufacturers increased the absorbency of fitted diapers by adding additional layers of fabric in the soaker zone - which increased bulk, drying time, and susceptibility of the diaper to urine residues (and eventual stinks). (thinking-about-cloth-diapers.com)
Fold this approximately 12» x 15» flat into thirds and you get six layers in the soaker zone. (kellyscloset.com)