[Audio fledgling]

Hi, I've recently been using some budget IMEs, and really loving the sound quality. For the budget ones, I really wasn't concerned about their lack of an IP rating, however, I'm thinking about an eventual upgrade, and have noticed that a lot of the compelling upgrades also don't have an IP rating. Is there anything in the same quality tier/class as the Kato, that has a decent IP rating?

I know everyone's primary focus here is sound, but I'm accident-prone/strange-occurrence-prone enough, that IP readings and durability scores, are definitely something I take a look at. Good audio only stays good audio if it lasts.