grace & stella's hot + cool gel bead sleep mask soothes and adds comfort to your eye area. The microwave-safe beads can be heated up or cooled down in the refrigerator to fit your liking. When the mask is cool, it can help with tired, puffy eyes and wake you up when you need it. When warm, our mask aids in getting a relaxing night's sleep as well as reducing any congested sinuses and increasing blood flow to your eye area. The super soft, plush backing makes it super comfortable on the eyes. No uncomfortable, cold, hard plastic here! Key Benefits Eliminates puffy eyes and dark circles beneath the eyes Relieves congestion and increases blood flow to the eye area Helps to keep out any light in your room, which creates the best napping environment Microwave-safe Soft, plush backing Directions: COOL: Place sleep mask in freezer for 15 minutes prior to use. WARM: Warm up in microwave for 10 seconds. Timing may vary depending on your microwave. Or place sleep mask in air-tight Ziploc bag and soak in a bowl of hot water for 10-15 minutes.