If you don't catch the leak/spill immediately, you're completely out of luck. I found this out the hard way. The only thing this mattress pad protects is Simmons' profit margin.Additionally, it is very hot and sweaty -- not comfy by any means, though at least it isn't loud.I hope someone benefits from my negative experience with this product.To solve the leakage problem: I put the $40 towards a microfiber base layer that is guaranteed against liquids, and a foam or fluffy merino mattress topper for coolness and comfort. So far, so good!