A non turn non flip mattress is a one sided mattress. This means that the fillings and comfort layer are only on the top. This means hassle free nights sleep with no need to turn of flip the product. The benefit of this is that the mattresses are often cheaper due to the reduction in over-all fillings, or, they feature higher quality materials for the same sort of price point. This means better value but does come at a cost in terms of longevity. After all, two sided mattresses get twice the surface area and will thereby take longer for settlement and wear to occur.