Justin
When you pop into driverswarehouse, speak to JJ (who makes them) or Paul (the son of the owner) ask if you could borrow/hire a membrane to try, ask if you would be allowed to offset the hire against the purchase of either a Neoprene or the Membrane. They will
A consideration for a Neoprene is that if flooded it will still have some thermal properties, with a membrane you won't of course. Good luck