DERYAN Luxe Dome - Pop Up tent - 2 persons - Silver - Anti-UV FPS 50+ - 2 seconds The bottle holder has a built-in heating pack, you can easily ''turn on'' by clicking it. Within approximately 20 minutes the holder is fully heated, and it can keep the bottle warm for up to 3 hours! After use, boil the gel for about 10 minutes and then you can use it again.