Instant Warmth: Snap the activation disc to heat up the wrap from room temperature to 130°F (54°C) in seconds. Natural Crystal Fusion: Utilizes a natural crystal fusion reaction for consistent heat. Reusable: Easily reset by boiling in waterno need for microwaving or freezing. Easy Reset: Simply boil to return to a ready stateno microwave or freezer needed. Includes: 1 lumbar warmer, 2 hand warmers, and 1 belt