I purchased this set for my guest bedroom and over the Labor day weekend my 70 year old sister slept on the mattress and fell out of the bed because the mattress kept sliding on the box spring.  The next day, I went out and purchased carpet grippers to place between the mattress and box spring, it did a little better but it still slides. Not sure what to do next except get rid of them.  Fortunately, she was not hurt, but imagine how I felt!!!  This is the first purchase I have been disappointed with!!