mason 4 inch gel memory foam sofa mattress full size white full mattressThe 4 Inch Gel Memory Foam Sofa Mattress combines premium comfort and smart design for versatile living. Featuring a cooling gel infused memory foam layer and a supportive high resilience foam base, it delivers medium firm comfort for restful sleep. The breathable knit fabric cover ensures softness, while the anti slip bottom keeps the mattress securely in place. Ideal for sofa beds, guest rooms, RVs, and boats, it folds neatly to save space.