FOR COOLING RELIEF: Chill in the refrigerator for an hour or put in the freezer for 5 to 10 minutes to desired temperature. Take out and gently place over the forehead and the temples. Provides soothing relief after a hard, stressful day. FOR WARMING RELIEF: Soak in warm water for ten to fifteen minutes or heat in the microwave at a medium setting for no longer than 10 SECONDS to desired temperature. Take out and place over the forehead and temples for warm, soothing comfort. Specially designed with our exclusive HERBA-GEL base, the Herbal Eyelid Compress goes beyond traditional water-based compresses. Our revolutionary herb compound gel formulation prolongs and maximizes the therapeutic benefits of the compress by harmonizing with the body's natural temperature flows, to soothe, relax, and invigorate tired, strained eyes. The Herbal Eye Lid Compress has a flex-band to fit all head sizes. Herba-Gel base is on toxic. For warm and cool uses.