I wear a Rolex Submariner homage on a nylon NATO watch band with a leather bund padded part of a leather bund watch band. One of my favorite watches. So tough and basic. The leather bund watch band is suppose to keep the watch off your wrist when the watch gets hot and cold, and when you get wet and sweat.
Yes these are a vey good idea on older 'trench' style watches as sweat on a hot day WILL find its way into an unsealed watch quite easily, obviously with a submariner you could wash the dishes or even go high diving with it on(if the seals have been replaced recently of course).
I wear a Citizen Ecodrive Nighthawk - a watch so big, black and featured that it would look appropriate on James Bond's wrist. Always keeps great time. Never have used any of it's aviation features, being technically a pilot's watch, they say, but you never know when a pilot and copilot will be incapacitated and you'll be the only hope. I'd hate to get to that point and not be able to do the pilot math figures. I prefer all metal watch bands, because they don't absorb sweat or disintegrate over time.
No quite the opposite, a leather 'bund' will distance the watch from the wrist and therefore away from sweat.Are you telling me my watch will break down more on a leather bund watch band? Some Rolex Submariner homages last for along while though, but most people don't use a leather bund watch band though. lol. Anyway, this is pretty close to what I have. But, instead of a one piece 10mm leather band. It has a 16mm leather band one piece. I have other size one piece nylon straps too. My original leather bund watch band came with two piece leather watch bands. But, the leather pad part is the most import part on the leather bund watch band though.