Hi:

Ive had mines for a short while and they are really fine.The time you mention on the water would concern me enough into buying more heavy duty SIMMS waders. They reek quality though. The medium I have, has larger feet than I would expect at that size. My feet are 8.5 and the neoprene socks on them are about size 10, so make sure you try them on first and put your boots on as well to get a good fit.

Migs