What do they look like?
I came across a pattern for a simple waterproof base with loops to hold any type of absorbent fabric. PERFECT!
I have decided to use only 2 different styles.
Both have a waterproof layer (P.U.L.- purchased in Australia), and both use a "base" with loops to hold folded "inserts" of any type of absorbent fabric.
Both designs are very quick to dry, easy to sew and simple to repair.
As soon as I can I'll stick some photos up of my prototypes!