Sleep Studio 1-Inch ViscO2 Green Tea Memory Foam Mattress Topper, Queen Queen 1-inch ViscO2 memory foam mattress topper for enhanced comfort; cooler sleep surface with 3-zone ventilation design Made of 3-pound density, open-cell memory foam with plant-based ingredients; natural green tea additive for fresh, mint odor Forms to body's contours for better alignment and pressure-point relief; minimizes motion transfer Spot clean only 100% Polyurethane