I don't own a pair of breathables I use bare neoprenes. But awhile back I did some shopping around and this is what I was able to find out. The Bare "Blackwater" breathables have had many problems. I phoned up the representative for loop and he explained to me that alot of the time people think their waders are leaking but what is actually happening is the gortex gets clogged with silt which inhibits them from breathing thus building up sweat in the clogged area. He said that Loop is coming out with a new type of wader made from a far superior material than gortex called simprotex or simprotech (not sure on the spelling) which should eliminate this problem. He recommended that I wait for these to come out. This was over 6 months ago so they are probably on the market by now. I decided to stick with my neoprenes because they are cheap and they work just fine for me.