tiangtech chillow multi functional water pillow massage mat cooling pillow pad reduces hot flashes, neck pain, fevers and more tiangtech on a hot, humid evening, keep a cool head with the chillow inside your pillowcase. chillow is cool to the touch without refrigeration, moving parts or batteries. to activate, slowly pour in 5-7 cups of warm water and let it set flat for 4 hours. make sure air bubbles are released by rolling an uncapped pad, forcing air out, and recapping to create a vacuum seal. all water + no air = cool chillow pad. never put in the freezer as it is self-cooling and freezing will ruin your chillow pad! sleep with the chillow inside your pillowcase for a more restful sleep. not recommended for children under five. care instructions: use a damp cloth for spot cleaning. 2 month manufacturer's warranty.