Awful don’t waste your money, Had an engineer out to look at the ridge and the dips in mattress and was informed by simba no issue. Funny that the guy who came to look and do inspection on the mattress seen a huge dip and ridge yet he didn’t photograph that and took photos that suited what the agenda was, when asked he said it was all visible and would not be a issue I guess they say that as once they leave nothing you can do and aim a will just pass the buck. Was great for the 1st year or so but now un usable and simba won’t honour the warranty avoid at all cost and buy something else or at least better customer service.