It is waterproof up to 50 meters deep. For those who worry that it may not work after being in the water. When in water mode it blocks everything else and when finished the crown is rotated to clean the watch speaker and returns to normal. In the text “Apple Watch Series 2 Review”, the author states: “Apple has gone a step further by adding pool and open water swimming tracking into the mix, which means you will be provided with a number of parameters including the distance covered, lengths, average pace and ability to distinguish stroke style is more than we expected and the even better news is that it works really well” (Stables explains why the watch is great for swimmers). for people who like to practice swimming. The watch tracks your swim by distance, time and even your most used stroke. The watch is not only useful for swimmers, but also for people who do a lot of things water, such as fishing, lifeguards, when washing dishes or if the rain catches someone in the car, and even for those who forget to take off their watch in the shower. Having a waterproof watch is a great product in today's technology