The Non-Scented Sinus Pillow by Kozy Collar is designed to provide moist heat and relief for sinus headaches, earaches and it is the perfect size for children's booboos. The Sinus Pillow can be used hot from your microwave misted for moist heat, or cold from the freezer. Simple,quick and easy to use! Just microwave on high 45 seconds to 1 minute should do the trick. Adjust heating as needed 30 seconds more or less. For cold pillow should be stored in a closed container (a plastic bag is fine ) and placed in the freezer. Also the freezer restores the natural moisture so when heated the pillow will have a moist feel to it but you may mist with water before heating to get the desired level of moist heat.