Review on Queen Size 3-In-1 Foam Wedge Mattress Elevator For Acid Reflux, Back Pain, Snoring And More - 7-Inch Elevation For Improved Sleep And Comfort by Nick Owens

When used under the mattress, this product is way too yielding (presumably you like whatever firmness your mattress has; with this product, say goodbye the that). The slick surface allows the mattress to slide down, mispositioning the mattress and causing fitted sheets to constantly roll off. It started off as "not good" but also flattens quickly--just a handful of months of use and it's so soft it just dumps me off the side of the bed and needs to be replaced. One of is about 150 lbs so it's not like it's getting excess weight. It's simply not firm enough, the foam doesn't last and the cover prevents it (and your mattress) from staying put.