This is a great mattress topper.  I ordered this for a bed at my second home which has a blah kind of cheap mattress in hopes that it could be improved rather than replaced.  This transformed the mattress into a luxury pillow top, super comfortable bed.  I let the pad completely expand laying fully unrolled on a floor for 24 hours before installing on the bed.  Once expanded, this was true to fit for the queen mattress.  And this is a great non-slip fit pad, it installs like a sheet rather than just elastic straps at the corners.  It stays put perfectly.  I am very impressed with this super comfortable topper, highly recommend!