I use waders in my day job - reckon on getting thro two pairs a year due to barbed wire and sharp rocks. I tried Gortex a few years back and to be honest it was bloody heart breaking when I ripped the arse out them! Stick with neoprene, you used to be able to get 2mm thick hobbies a while ago which were ideal for summer use (I can walk 2 -3 mile in waders) , I also found that the booty waders combined with a cheap pair of steel toe capped hiking boots were a lot less fatiguing than waders with built in boots.