Sleep Joy 2" ViscO2 Green Tea Memory Foam Mattress Topper, California King Breathable 2-inch ViscO2 memory foam topper for California king mattress; 3-zone ventilation technology for cooler sleep surface Made of 3-pound density, open-cell memory foam with plant-based ingredients; natural green tea additive provides fresh, mint odor Forms to body's contours for better alignment and pressure-point relief; minimizes motion transfer Spot clean only 100% Polyurethane