tman,
After rubber waders as a kid, hodgman neoprenes as a younger man, I finally owned two pair of Simm's breathables, at the same time. One with zipper and the other just pull up. As I age I am less and less comfortable in deeper/stronger current. I recently bought my first pair of wading pants. No zipper. Patagonia is the brand. I keep the belt loose and keep them up over my beer belly with suspenders (from Mark's). I love them. Something to consider. Good luck.