Guarantee - Extra sealable PE bag is provided to store the ice pack, prolong the usage lifetime and isolate the fridge odor. If there is any problem with the product, please feel free to contact us for a refund or replacement. Hot or Cold Use - This gel eye mask is both microwave and freezer safe, allowing you to use hot or cold therapy depending on your needs; Simply cooling it in refrigerator for 2-4 hours for cold Therapy; Or heating it in microwave for 30 seconds for hot therapy. Flexible & Universal Fit - Designed with adjustable, firm fastener closure to adjust around your head for a secure and custom fit. it completely covers the sinus, forehead, cheeks, and jaw. Made from non-toxic, medical grade gel beads, that remain flexible even while cold or hot, allowing it to conform to your eyes and sinus area and reach deep into the tissue to reduce pain and tension. Soft Plush Backing - This face ice pack is made of medical grade premium PVC and soft plush. The soft plush side allows for direct skin application, providing mild coldness to prevent frostbite, and achieve a more comfortable, spa-like experience. Effective Relief & Faster Recovery - Face cooling mask gently provides soothing relief for puffy eyes, dark circle, sinus headaches, migraines, tension, facial fatigue, and is also highly recommended to speed recovery and reduce inflammation after different facial and jaw surgeries, from wisdom teeth extraction to nasal and skin bruising.