10” Topaz Mattress – If you have been comparing 10” Gel Memory Foam Mattresses, you just found the winner. 2” of Superior Gel Technology (SGT) Premium gel memory foam offers a medium feel that contours to your body and molds to every curve. A gentle softness is felt as soon as you lay down. The 8” moderate density support core creates a medium supportive feel. A high quality washable velour cover has stone suede border and is washable, soft and supple.