Sleep Studio Sleep Joy ViscO2 Green Tea Ventilated Contour Memory Foam Pillow Breathable memory foam contour pillow for back and side sleepers; with natural green tea additive for pleasing, fresh aroma ViscO2 open-cell memory foam made with plant-based ingredients; air channels for ventilation and cooler sleep temperature With 4-inch and 5-inch high bolsters for custom neck support; Removable, washable velour cover with mesh side panels for air flow; spot clean foam 100% Polyurethane