Has anyone used this pressure relief mattress?
https://www.qoo10.com/item/BION-ANTI-BEDSORE-MATTRESS-2-5-INCH-4-INCH/489831980
It's the beige coloured one 2.5 inches thick I'm interested in.
I'm trying to find out if the air pump is noisy and if the mattress actually works?
Also I've...