Olee Sleep 13 Inch Imperial 4 Layer Gel Infused Top Memory Foam Mattress (Queen) 13FM01Q 3.5 inch High Density Foam Convoluted Layer helps make flow to ventilate air 5.5 Inch ILD 28 Density 29 Pound Foam supports your body and disperse Weight 2 Inch Dura Cool I Gel ILD help you have sound sleep Non temperature sensitive Poly Mesh border makes flow to ventilate air. maintain mattress sound Pass 100000 times roller test