We are often asked the difference between our PUL nappies and our Minky.
Both are water resistant and do not require any extra cover.
PUL is a flat/smooth Polyester fabric and Minky is a fluffy fabric with a 2.5mm pile to it. It is softer, much like a velour feel.
Some parents prefer the feel to one over the other. Others prefer the look of one fabric over the other. Essentially, both function the same but look and feel different.