The Twilight Box Pillow Top has an excellent edge foam encasement which provides greater stability, a firm seating edge, and a larger sleeping area. 858 individually luxury plus encased coils are designed to seperately respond to the body, reducing motion transfer, so when your partner moves you can still enjoy and undisturbed nights sleep.  Offering 2 layers of iFusion Technology, a combination of open cell memory foam and pressure releiving gel resulting in an optimal tempurature sleeping surface while still conforming to every curve of your body.  With AdvantaGel, an intelligently designed infusion of gel and resilient foam, youll get a cooler sleep with luxurious comfort and durability. Our Super Stretch Tencel Fabric is a natural and breathable fabric that offers pressure relief at the surface of the mattress allowing the sleeper to benefit from the Lift and Reduced motion below.