Dry suits come in lots of models. For the best and really only practical use, the models made for kayaking/rafting, not scuba diving make sense. A person has complete range of motion. Some have neoprene Velcro cuffs and neck gaskets that are very comfortable but not completely waterproof. Maybe a little leak if ya fall in but certainly nothing like stepping in over your waders. Other suits have tight fitting rubber gaskets that are completely waterproof even completely submerged for extended time. You could even swim over to that otherwise inaccessible spot. (Please know what the hell you’re doing before trying such a stupid idea!)
The feet in dry suits range from a waterproof fabric to neoprene to rubber. Get a big boot and loosely layer socks or use electric socks or both! Put anything on under the dry suit. Take some off to hike in. If it’s not raining pull the top down and you’ve got just rain pants.
I’m not sure why something like this wouldn’t be great. (I’m not recommending, don’t know this brand but like the style with the hood.)
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