It fits..... but it ripped TWICE (along the seam, but also the material ripped!) while it was being put on... not very sturdy... even though I was trying to be gentle as possible. I will sew it by hand, but I think that means that it is not bed bug proof anymore...... I wish that there was a zipper on the other side as it was quite difficult to get my gel topper in there as well (could not do it at the same time, as mattress is “floppy” due to no springs).