How do Hot and Cold Ice Packs Work?

Gel Soft Ice Pack Physical Therapy Hot Cold Pack - China Ice Pack, Hot/Ice Pack

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Small Heat & Ice Pack, Reusable Hot Cold Therapy Pack

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X 11'' Hot Or Cold Therapy Gel Pack, 60% OFF

Small Ice Packs, Boo Boo Ice Packs for Injuries Reusable Hot Cold Packs Bulk Cold Compress for Pain Relief, Various Color, 8 Pack (Multicolored A) : Health & Household

Round Hot and Cold Packs, Custom Ice Pack

The Cold Pack: A Chilly Example of an Endothermic Reaction