Important table if you are considering and looking for sport / work out headphones. It gives you list of official water resistance ratings which every manufacturer should put in specification table.

IPX0:No  water resistant. Headphones will be destroyed.
IPX1:Headphones are not suited for exercising. They are not sweat proof. Minimal impact of water is dangerous. Protection from dripping water from above for at least 10 mins is given.
IPX2:Protects from dripping water when the headphones are at specific 15 degree angle. Headphones having this rating should not be wireless for outdoors wear.
IPX3:A little better. Headphones can get a spray of water at 60 degrees angle from the vertical for at least 5 minutes. It is too weak for sweat protection. At a worst case – you can use it for exercising.
IPX4:Your headphones are sweat proof. It is suited for workouts. It can handle splashing of water from any directions. But it is not water-resistant.
IPX5:Headphones are protected from water spray at 6.3mm (12.5 liters/min) at any angle for at least 3 minutes.
IPX6:Your device is secured from 12.5mm distance spray of water (100 liters per minute) at any direction for at least 3 minutes.
IPX7:Headphones are OK if completely submersed up to 1 meter (3 feet) for up to 30 minutes.
IPX8:The best index. Look for it if buying swimming earphones. Look for specific details given by manufacturer similar like “The device was tested at “x” meters for “x” minutes”.
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