Depends on where you fish and the season and the maker. Cold water fishing needs extra room for heavy sox. Orvis Battenkill Brogues seem to run true to size, I go one size up to allow for extra insulation during the winter steelheading season. Water in the 60's and above doesn't need extra insulation so I have a pair that are the same as my regular shoe size for those conditions. Something else to think about: sole material. felt or rubber, plain or studded. Studded soles are a no-no in a drift boat but an ablolute necessity on moss or algae covered rocks. You thought that this would be simple, didn't you. Good luck
Carl Kocian, AKA 'wet butt'
