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Unlike frozen water or gel products, the Phase Change Material maintains a consistent temperature of 78℉/26℃ and expels energy at a constant temperature during its transition from a solid to a liquid. This ensures that the user receives a constant, cooling temperature throughout the entire 2-3 hour period. Time to freeze:approx. 30 minutes, Time to thaw: approx. 120 minutes. Freezes in refrigerator, freezer, ice water. Reusable, non-toxic, no condensation, soft.