PInwheel perforations don't work. In order for the wetness to soak through effectively into outer layers, there has to be enough of permeable surface, so what I do is, I cut stripes of permeable non-woven fabric of appropriate size and stick double-sided tape to it, attach the diaper to a flat surface, mark the shell and cut a piece of it out, and adhere the permeable fabric. Last four pictures are of the diapers about fourteen hours and 3+ liters of water later, from the inner fourth to the inn