Rest Assured: Twin Top Pocket 200  Spring System This is a Hand Nested Pocket Spring System. Each spring is tempered and preset to ensure long-lasting and consistent support. Being hand packet in a nested manner, it offers a very high spring count to enhance weight distribution. The higher spring count also makes room for heavy people.  Edge Support A Restex Encased construction offers a firmer but still comfortable seating edge. The Encased edging stabilizes your mattress and provides a greater sleeping surface. Turn Mattress Optional No Turn / Turn Comfort Layers Extra high-density Restex and Permaflex foam layers have been used to provide superior, long-lasting support and comfort. Material A knitted Jacquard ticking enhances the breath ability of your mattress and airs well. This helps the mattress to remain dry and fresh for much longer. Being a knitted material it has a stretching ability that combats wear & tear.