... bag remains soft even in -18 degree Usage:Cold compress: put the cold/hot bag into freezer to be refrigerated for half an ... be used continuously.Purpose:Cold compress: physical therapy for traumatic hemorrhage, heatstroke, itch, headache, strain, scald, fatigue.Hot compress:alleviate rheumatic pain, ... bag can only be used for external medication. If eye or skin should contact the content, it must be ...