Sleep feeling stand is immune, after getting all feel so uncomfortable , so it is not too soft ? The mattress is too soft , spine bending down , waist fatigue , severe cases can lead to Yaosuanbeiteng , so the mattress to moderate hardness . Hard and soft mattress alone can not pick , tips : first sitting mattress side , after standing up , if found the mattress just sitting position subsidence occurs , it means that the mattress is too soft . May be lying in bed, trying to insert the waist and palm mattress gap , if the hand can easily be interspersed in the gap , it means that the bed is too hard ; if hand close the gap , which represents moderate hardness . If you buy a double mattress , sleeping with the best tested together , the heavier the mat one can turn around, shake Look mattress will affect the other.