Guys, allie-mum-um on the bottom of boots is 'old school.' Dan Bailey had there 'Stream Cleats' out years ago (no longer make them) but you could run up the side of a tree with these 'over-boot' things. Clunky? Without question. Did you go for long walks (save for in the water) with them on your regular wading boots? Not a chance. Pain to put on when needed? So yes.
But for fifty bucks the best life insurance policy you could buy. The soft allie-bars on the bottom would grab-hold on to anything ... including the polished lava slab rock bottom on the North Umpqua or Deschutes here in Oregon.
Posted this up before (where-ever) and retrofitting existing boots with allie-bars is total simples. Hit a big box hardware store and get a flat bit of alli bar (1/4" thick is best) and (if you don't already have same) two drill bits. One to drill through the bar (thread of screw size) and one to counter-sink the screw head.
Screw length is 3/4 of the thickness of the bar and 3/4 into the bottom of your boot bottom. (Give or take!
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Measure/cut the bar to boot width (two for heel, 3 or four for the rest. Drill the screw holes, counter sink so screw head is below the bar and zip in. Almost forgot: a small bottle of Gorilla Glue (or water proof) and put a squirt of that on the screw heads. Once that sets up, the screws/bars aren't going anywhere unless you want.
fae