Ive a pair of Crocs slingbacks that dont chirp, so maybe it was just the weird fit on these? Fit is slightly awkward over one of my heals that is permanently swollen from an old injury. My son used his in and out of the pool, sand, ocean and all boats. I did a good bit of research b4 buying, & these came up in most every "Best" list on the internet, usually in the "Best Bang For The Buck" or "Best On A Budget" category. It was a bit disappointing that after only 2 months of intermittent use (leg days only once a week), this sponge split right down the inner middle of the sponge. These ones should last a long while. Love my new case. I switched to my Comply tips, but the stock tip would have been fine. The GSP series just feel like a marketing ploy to target gamers and cut corners. Si los aflojas ligeramente de tus oídos son muy cómodos pero no sellan bien las gomas, no creo que sean para todos los oídos.