DANISH ENDURANCECushioned Ankle Running Socks for Long Distances, Anti-Blister & Sweat Wicking, Men & Women, Unisex 3 Pack

How thick are these socks? I have a pair of the longer socks that are too thick for my shoes and im looking for something lighter

Are they waterproof?

Are these any good for Walking marathons?

Size 8.5 feet which size