Brooklyn Bedding Best Mattress Ever

Hopefully I’m not getting too far off topic, but as I have the #BME this seems the right place to post.

On top of the mattress, I’m currently using a Malouf SleepTite Mattress Protector - it’s cotton topped with a poly membrane to keep liquids away from the mattress. However, it seems like the protector makes the mattress firmer, and it also sleeps warm. So back to square one.

As I’m potentially worried that the mattress might be slightly too firm (when I side sleep I often get numb arms), I’m considering mattress pads/ protectors as an option instead of going right to an exchange.

Does anyone have thoughts on a waterproof mattress pad? This one on Amazon seems like a good possibility: ExceptionalSheets

I’d be willing to consider wool, as waterproof isn’t a necessity (although it would be nice). I’m more concerned with keeping the mattress softer, not firmer. I’ve read through this post Post #89 and the these seem like they might be too thin for my needs.

Something that will help absorb water and soften a little bit would be the key – thanks!