The basic one that comes with the watch. Non porous and you don’t have to buy anything else. I work out with mine a lot and never had an issue.

I’m getting downvoted for asking this in a goddamn Apple subreddit. If you want to know how a holocaust is possible, start with people downvoting for asking a question and work your way out from there.

Good lord I hesitate to think of the average iPhone user who hears about this, tries it, and winds up with literal vermin and spiders cascading out of it like the masks in Halloween 3.

I don’t follow Android, does this happen with a more open OS? Like tons of malware and shit? I mean with normal people, not Redditors