Ideal for temperature sensitive medications including Insulin, Growth Hormone, L-Thyroxin, Polyarthritis medications and many others. The cold Gel-Pack keeps the insulin and other medications cool for up to *4 hours and is easily refrigerated. Water resistant and extremely durable, the Daymate will give you years of service. Made of water-resistant durable nylon the DayMate includes a FREE Cold Gel Pack for use when temperature extremes are a concern.