I was out this morning with the dog in the boat. It was shortly after dawn and the pond was dead quiet and still, save for the birds. I was looking for wildlife and working my underwater returns to effect silent paddling, but found that the sleeve of my water-repellent breathable jacket (generic gortex) was rustling against my pfd. It's probably not enough to disturb wildlife unless at very close range, but I got to wondering what materials might be quieter and still good for shoulder seasons. Fleece and wool crossed my mind.
I don't own a wet or dry suit and am very cognizant of dressing for immersion this time of year, which for me involves water repellent layers to reduce initial cold shock (along with staying close to shore on quiet ponds and carrying a full clothing change with excessively warm layers in a dry bag). I'm not sure fleece or wool would do as much as the goretex. Am I missing an option? I imagine all pdfs are made of the same type of synthetic fabric, so it has to be the outer layer that changes.