Colorful & Fun Reusable Hot/Cold Eye Mask & Soothing Gel Pack for Sleep or Travel. The perfect item to help you fall asleep, while keeping that fun and colorful look in your sleep wardrobe. To use cool, place the mask gel in refrigerator for 15 - 30 minutes. To use heated, place the mask gel under warm running water for 1 - 2 minutes. Size : 7.5" x 4" and one size fits most. This item is perfect for yourself or for gift giving.