The 4” wave construction in this topper is one of the most popular on the market combining the value of a top-of-the-line 4” thickness in memory foam toppers with the comfort of memory foam and a unique convolution textured pattern. This premium topper features gel-infused memory foam with a textured wave pattern on one side for reversible comfort options – massaging comfort on one side; uniform pressure relieving support on the other. All memory foam is 100% CertiPUR-US certified. The topper is manufactured in all standard bed sizes.