This mattress was far too firm and higher in the middle than at the edges to the extent that you felt as if you might roll off. When it came to returning it was a nightmare - at least four vans turned up and refused to take it despite numerous phone calls to amazon. Very disappointing as I am a big fan of Amazon usually.
Bought this for my 'clumsy' grandson at a very reasonable price. It does exactly as intended....protects the tablet whilst not interfering with anything else. Totally simple to fit and secure. Fastens perfectly. Reccommended.