What is the product in gel packs made of?

The product in gel packs is typically made of a water-based gel or a polymer solution, often combined with other substances like sodium polyacrylate or silica gel to enhance its gel-like properties. These gels can be designed to retain heat or cold, making them useful for therapeutic purposes. They are usually encased in a durable, flexible plastic pouch that can withstand temperature changes. Some gel packs may also contain additives for color or to prevent bacterial growth.