This is definitely waterproof, but in being so waterproof it's not really breathable. My boyfriend has 'accidents' and when he drains his adult bladder it doesn't leak through to the mattress. But with that being said; I do find myself breaking out in sweats with this new fully waterproof pad. I've washed it twice now, and no tears or mis-shapened form yet! So far its the best mattress pad I've found for the price.