Cover: With a 50% cotton cover and 50% polyester cover. Non allergenic: Ideal for those with sensitivities to feather and down pillows. Material: Polyester keep you warm in winter, and cotton to keep you cool in summer. Pillows: Get one, two or four climate control pillows! Filling: Features a cosy and comfortable soft hollow fibre filling. Easy care: Machine washable at 40°C! Climate Control Pillows | Living Social