One stop gap measure that I have used while on the river or using waders that I knew leaked (Cabela's Dry Plus) was to stuff my feet into a tall white kitchen trash bag then into the waders. Leaky waders-dry feet. This in an Alaskan river. SO no wet feet meant no cold feet. I fished I caught I smiled. I bought Orvis Silver labels- no leaks in two AK trips and have glued the leaks on the Dry Plus and used them for backups on my AK trips or whereever the water is warmer. Works for me. The Dry plus are 5 years old now going on six the silver labels are going back to AK this fall.

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I fish, therefore I swam.