As I understand it waterproof doesn't exist in watches. It is a question of water resistance at a certain atm of pressure. If the watch can't handle a shower than I don't think I would want to be caught in a downpour while running or hiking. Considering the importance the health aspects in the marketing of the watch I would imagine the watch will be water resistant. You may not be able to swim with it but certainly a rain storm should not be a problem. If not, I would just get a GarminGarmin makes watches with GPS, etc. that are water resistant enough for a pool and others that are not. The ones that are not, can be used in the rain no problem in my experience.