i thought (from the description) this may be interesting...but i looked at the video on the website and realise it will be very difficult to use - as it is fully encased, it means that the sheet has to be placed underneath the mattress then zipped around the edge. For me, it would just become impossible to take it off and clean and put back as the mattress is too heavy - even turning it hardly ever happens!!!
Good luck if you do get it...I like the idea but it unfortunately will not work for me...