Sealy response clusterfil pillow is encased in a unique premium quilted supersoft plush microfibre cover that naturally responds to your temperature. Medium support. Deep filled with Dupont cluster ball fibres which emulate the natural smoothness and luxury of silk to provide superior comfort and support while you sleep. This pillow is perfect for back and side sleepers. Non allergenic which is great for people with feather allergies. Medium: Back sleeper.