Woof Wear�s Hot & Cold Packs contain a Gel which remains flexible when frozen to -20 C. This allows the packs to be moulded around joints to speed healing. Designed for use in Woof Wear�s Polar Ice Boots. Riders love the flexibility of the packs straight from the freezer. � Can assist in Hot or Cold Therapy � Designed for use in Woof Wear�s Polar Ice Boots � Flexible when frozen � Contains 2 Gel packs