Waterproof ear buds are much cheaper and I prefer ear buds over headphones unless it is very noisy or cold.
Yours are waterproof up to the bottom of the earmuffs. If you are hunting saltwater with waves, you will need either the Garrett Blue headphones or the Gray Ghost amphibians. I use the Amphibians both on land and water, they are a tighter fit than the standard Garrett's.