Mattress Ventilator
Mold loves to grow inside mattresses when they get too humid and can’t dry out easily.
That’s another plug for keeping the humidity level in your bedroom below 50%! However, mattresses can also get humid just from the moisture released from our body at night.
That being said, you also want a well slatted bed support that allows the mattress to release moisture from below while your body adds moisture to the mattress from above.
Most people have well-ventilated slats under their mattress, but if not, you could swap them out for a different style of bedframe or get this mattress ventilator.
This ventilator is something I recommend EVERY RV lifer get for their RV mattress because RV bed supports are almost never slatted or what’s beneath the slats is another closed cavity. That’s why mold is almost universal in RV mattresses unless they’ve got something like this under them.