Boosts have IPX7 rating (which is basically as high as it gets for waterproofing of electronics (maybe NASA requires higher...don't know ring NASA!).
NOW why don't YOU tell us why the Max would be any different to Boosts IPX7 rating?
https://www.macworld.com/article/3299037/nuheara-iqbuds-boost-true-wireless-earphones-review.html
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