We bought this as a waterproof mattress protector; I'd agree with the other reviewers that this wouldn't necessarily be suitable for bed bug or dust mite protection because it fits over your mattress rather than completely incasing it. However, it's exactly what we needed; great price, washes easily, and fits over our very deep/thick King mattress. It also feels like it breathes a little better than other waterproof protectors we've tried.