Back in the 1970s Seal-Dri waders were one of the top choices for many fly fishers.
They came in two weights: #50 and thicker HD #100.
Stocking foot waders were far better for wading a stream than boot foot waders.
Pete Woolley, Fly Fishing Outfitters, and I would go together and buy 50 pairs each to get a special wholesale price.
Here is an article about Seal-Dri waders on Herb Burton's Trinity Fly Shop website: