Is this for yourself or another person?
Overall you probably want a neoprene stocking foot breathable wader, the material is very light weight, waterproof, and won't leave you feeling like you are in steam bath. I have seen them for under a $100 at big box store like Dicks. Amazon also has a number of choices as well.
As for sizing waders run on the big and baggy size. Just look for the smallest size that your measurements fit under the max measurements they give, while leaving enough room for layers. My waders sock size is a few sizes bigger then my foot but I don't even notice once I get my paddling boot on and my feet stay nice and warm.
Heel and Pegpads™
Wabakimi Canoe Pack
Touring Kayak Paddles
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