Headphones with an IP54 protection class are protected against dust and splash water:

5: Dust-protected (limited protection against dust, but the ingress of dust cannot be completely prevented).
4: Protection against splashing water from all sides (protected against water splashing against the housing from all directions).
This means that the headphones are resistant to sweat and light splashes, making them suitable for everyday use and sporting activities. However, they are not completely waterproof and should therefore not be submerged or used under a strong jet of water.

The headphones have proven themselves in use during sports, outdoors in the rain and occasionally even in the shower.