Thought Iād contribute my take as something of a warning. I got a pair of Scierra stockingfoot breatheables and was confident I could save money on boots by simply using a pair of quite expensive cross-training shoes which Iād mistakenly bought a size too large. There developed holes in the back heel of the waders. Iām guessing, where the top of the shoe was rubbing against the neoprene. I fish mostly in the sea; single and rocks. But not that frequently. Iād say not getting a purpose-designed wading boot is a false economy.