ThermalSoft durable reusable hot/cold packs are 100 percent leak proof! ThermalSoft durable hot and cold packs maintain an even temperature over the entire pad. The soft gel contents are leak-proof and contain no liquids or dyes. ThermalSoft durable hot and cold packs are biodegradable and non-caustic. ThermalSoft durable hot and cold packs keep their pad like shape even at high temperatures and will not liquefy when heated. When used for cold therapy, ThermalSoft durable hot and cold packs stay flexible when frozen. They bend to fit around treatment areas and maintain their thickness no matter how severe the bend. Durapak Pack - small - 4" x 6". Manufacturer Contact Information Not Applicable