Which is the best organic mattress cover?

I just bought my kids brand new, Organic Cotton/latex/wool mattresses, but have a big problem.
My son has diabetes and when his blood-sugar is high, he wets the bed. But he WETS the bed. Meaning - a big puddle. Are the natural wool or cotton Mattress Pads going to work for him?

i would think it would soak thru. i know they are not organic but i worked in a nursing home and used what are called chucks under our residents. they aren't organic but a lot better than plastic. i would think you could find them at any medical supply store.

good luck.