The JBL Endurance SPRINT, JUMP and DIVE can be used in salt water (i.e. sea) but we recommend to thoroughly wash the headphones in fresh water after every use in salt water, to remove the salt residue. Please note that only DIVE can actually be used in water, because it features a function lock and a built-in memory for MP3 music files. SPRINT and JUMP cannot be used in water, because the touch buttons will malfunction when submerged, and Bluetooth cannot function at all under water.