Purchased This Bed Bug Cover To Go Over New 15 Inch Mattress. Though Manufacturer States It Will Fit Up To An 18 Inch Mattress Found It Just Fit Our 15 Inch Mattress And I Was Unable To Add A Mattress Cover Underneath As I Had Hoped. For The Price It Is A Nice Thick Cover And I Believe Will Last For While. I Had Purchased A Cover Before By Bed Blocker And Ist Was Much Thinner And Had A Terry Like Cover Top Cover That Shredded And Pilled. This Has No Terry Like Top Cover Which I Was Glad It Did Not Have. Tough To Get On Though Definitely Need Two People To Get It On.