HTF Exotherm Medical™ products have been developed using the same technology as all the Cool Zone Cool Products. This technology enables the medical products to maintain a constant temperature for more than an hour, allowing a much longer treatment period than comparable ice or gel packs, which are unable to maintain a constant temperature for a prolonged period.
All products placed in a freezer for 6 hours @ -12°C (10°F)

These products have a number of other advantages over the use of ice or gel – they remove the risks of freezer burn, frost bite, vasoconstriction or any possible soft tissue damage.