I just tested my new 50m lap pool and I'm thinking of perhaps bone conductive headphones? I could add an under and several normal air speakers and maybe that's the best way but I'm not sure. I can order from Amazon but there are a lot of options, I am wondering if noise canceling is effective with bone conductive? Any favourite to recommend?
I use shokz openswim pro. I bought the basic version first which was good. The top of the range is much better though- so I use those now.