Odyssey Elite MattressesMattress has 5 different zones of anatomically designed dye cuts help minimize pressure and skin shear from head to foot, increasing patient comfort, and brass vents that allow mattress to breathe Visco elastic conforming top layer helps reduce pressure and prevent friction and is flame retardant and fluid proof Super conforming layer of visco elastic foam cradles the fragile bony prominences of heels and ankles while slip resistant vinyl bottom