Just a personal thing and I make absolutely no claim that this is good for anyone else. I hate being cold and I'd rather be on the warm side of the cold/hot spectrum. I'll even sacrifice a little sweat rather then be chilled or have numbed toes. Therefore, I almost exclusively wear 3mm neoprene waders. I can always adjust what I wear under them. As far as which manufacturer or model, I buy inexpensive ones and replace them as needed. I usually get 3 or 4 years out of a pair.