The manufacturer of the Protect-A-Bed Mattress Covers decided to use the measurement of the product before it is placed on the mattress. The covers are made to stretch and should fit very snug to ensure the effectiveness of the encasement. We have sold this cover for mattresses up to 15"…
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We would suggest to go with the larger size of the two to make sure there is not too much stretching on the encasement and to give more room for it to move and not tear as you sleep on it.