This was the only mattress topper we could find for our Sleep Number mattress after calling Sleep Number and finding they didn't offer any protection for this size manufacture. that we bought (Flex Top California King). Fits on the mattress but there is no hole for the tube. We ended up having to cut a hole, making it virtually impossible for us to buy a mattress topper. All in all, it's better than nothing and will hopefully protect against leaks, but it won't do much if there's ever a bug problem.
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