ThermalSoft DuraPaks hot and cold packs maintain an even temperature over the entire pad. Their soft gel contents are leak-proof and contain no liquids or dyes. ThermalSoft DuraPaks hot and cold packs are biodegradable, non-caustic, and, because ThermalSoft DuraPaks are reusable, they save you money, too. Whether by accidental cuts or punctures, ThermalSoft DuraPaks are 100% leak proof. Available Sizes: