After reading some complaints about simba mattress the other day about the dipping of them I decided to take the cover off the mattress which they say don't do and sleep on the underside of the mattress it was really comfy I washed the cover on a cold wash which was fine then we put it back on and slept on the underside again so it just goes to show you can do everything to it they say don't and it now seems like a new mattress so I'll be turning it top to bottom and over but when you take your cover off you will that simba make a lot of money out of you as I bought the same sort of mattress for my daughter years ago and it was no different