If didymo and invasive species can be passed on through felt, what is stopping it from being carried by the material your boot is made out of? Or your neoprene on the foot? I've never understood that argument for rubber vs felt.
Look at it this way, if you're going to be doing long hikes (3km+ a day) in your waders on average, get vibram, if you plan on standing in a few holes and you're worried about falling in, or the wading/cross could be tricky, get dont hesitate on the felt. Nothing beats it.
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