Yes, but technically most of them are WR50, water resistance rated, meaning they are water resistance capabilities under 50 meters of submersion. Fitbit and Apple may advertises the devices are capable of handling activities such as swimming, or salt water, and, in some cased, even in a hot tub or shower. However, neither of these company's recommend using the device where high water pressure may be exposed to the device, in cases like SCUBA diving, or water skiing. Nothing is truly “waterproof” and I highly doubt that water damage would be covered under any type of warranty.