Sensual & therapeutic, this heart shaped heat pack warms up to 129 degrees. Once activated it will stay hot for about an hour - great for hearing up those chilly nights, calming cramps, and relaxing your sore muscles. To reuse, reheat in boiling water for 7 - 10 minutes or until crystals reliquefy. Use non-piercing tongs to carefully remove heated body massagers from water and allow to cool to a comfortable temperature suitable for body contact. Do NOT use microwave to reheat. Color/style may vary.