Northbrook Tight Top MediumPrecisionFit Coils flex to your bodys individual needs, helping to maintain natural alignment and reduce nagging Bed Aches. Encased coils offer robust support by reducing motion transfer, helping you feel less movement from your partner. The MoistureProtect Cover wicks moisture away from your body to help keep you cool and comfortable. The DuraFlex Coil Edge surrounds the mattress for a solid seating surface thats more durable and flexible when paired