Reddit reviews Realproof Waterproof Apple Watch Case 40MM Series 5 / 40MM Series 4 with Premium Soft Silicone Band Built-in Screen Protector, iwatch Protective Case Slim Thin Drop Shock Proof Apple Watch Case

I starting wondering about this same thing, but I'm not sure. It seems like a trade-off between what you described versus significantly more water exposure.

This is the case, which I don't recommend for obvious reasons. I think I'm going to return it.

There is a Catalyst case, which is like $70 and significantly more expensive, but it's at least a more well-known brand, despite the fact that their case doesn't enclose the watch completely. So, I have my reservations on the Catalyst one as well.

I ran the Palmerton Super this year with my Apple Watch 4. I know it is waterproof, but I was afraid of rocks and mud getting to it. So I bought a case on Amazon that was completely sealed and waterproof so that I could still use my watch but have it protected as I got through the course. Worked like a charm! And I’ll be using the same band to run a sprint in about a week.

Realproof Waterproof Apple Watch Series 4 Case 40mm with Premium Soft Silicone Band Built-in Screen Protector, iwatch Protective Case Slim Thin Drop Shock Proof Apple Watch Case for Men Women Girls https://www.amazon.com/dp/B07R3X7GPZ/ref=cm_sw_r_cp_api_i_vmEwDbBXPY4XY