This is a great mattress cover. We are very happy with the quality! With that said I'd recommend this for king size matresses upwards of 15+ inches thickness. We bought this for a 12 inch and it's definitely a little too big however, it is stretchy and therefore we are able to tuck the excess under the mattress so it's not obvious at all when the sheets are on.
I bought this for an old hand- me- down mattress. The deep pocket covers both the mattress and box springs and the sheet fits nicely on top. Or I can put a 3-inch bed topper and it fits over that. My company will never know they sleep on old mattresses. I can't even tell the mattress protector is there. In this case I am using it for a sleeper protector and it works great! The pillow covers are a bit large and when we lay on them it takes 5 seconds for the air to leak out. (These are new pillows I want to protect for drool, ear wax, and head oils. they work)
I just wish you could find mattress pads that when you say you need a queen size the top of the cover actually stretches to fit the entire bed. I inevitably end up with an inch or two not covered by the pad. This is very comfy though and nice and puffy. Went on easy.
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