... Also known as: cold hot pack, gel pad, gel pack, compress pack, microwavable hot cold pack, etc. MaterialPVC, PE+PA ... the freezer so that the pack is ready for use in case of injury. Approximately 1 hour is ... the skin. It is recommended that the gel pack is wrapped in cloth before applying to skin. ... , remove from the heat, and immerse the gel pack for approximately 4-10 minutes. After 4 minutes, ...