Most calls are great but occasionally I get weird crackles or Hi then low sounds on a voicemail. The expectation is it will work just as well with the sea kayak as it has with the surf kayak since my friend uses one to transport her 17 sea kayak and highly recommends it. Then, magically, without any alteration it just decided to start working correctly. With a corded headset, if you so much as touched the plug, it would stop playing. Giving 5 out of 5 stars. Awkward to put on, very slightly uncomfortable, but they stay in/on my ears when active or exercising. I particularly like the visual mute indication (lights go red)I love the portability of the device - its simple to just pick it up and change rooms, moving between various locations with no audio problems. One of them had dark, splotchy red spots compared to the rest of the inside and the other one had fabric missing on the shelving, barrier part that made it look torn and worn down. I strongly recommend you purchase without hesitation, you will not be disappointed. I guess they expect that you will move the straps from the front / rear to the side rings.