Grand Hybrid Gold MediumBalanced and breathable, the Gold Medium mattress offers ideal support and comfort for stomach sleepers who prefer a medium feel. The advanced cooling cover, woven with PE yarns, provides best in class temperature regulation and a smooth, breathable surface. Inside, gel memory foam combines with Serene Foam to create a supportive yet contouring sleep experience that relieves pressure without excess sink. Zoned, individually encased coils deliver