Review on Twin Size Zippered Mattress Protector Encasement - Premium Terry Absorbent Cover With Six-Sided Waterproof Protection - Quiet, Breathable, And Fully Washable by Leroy Jacobs

I have an 8-inch foam mattress and a 3-inch topper I placed on top of it to make it softer. The problem is each night it shifts about 4-7 inches. So, this one is big enough to hold 11 inches deep mattress, even though the package says 9 inches. This is ideal for people who use a topper on top of an 8-inch mattress and have the same issue with shifting. Don't buy bigger mattress holders as they will not prevent shifting, it has to be a depth, the maximum depth, the extreme of the range as the sum of your mattress and mattress topper, in my case 8+ 3 is 11, this mattress description correctly says it can do up to 11 inch deep mattresses and combos. Works well and the package says it will keep away bed bugs as it is bed bug proof and also all kinds of dirt, dust, and with the dust, all the dust mites bound to dust particles. So i would say 5 stars. at least for what i bought it for. :)