... therapy packs, one unit with hot and cold fucntions( two in one), save one cost Cold/Hot Pack:Purpose:Cold compress: physical ... for traumatic hemorrhage, heatstroke, itch, headache, strain, scald, fatigue.Hot compress: alleviate rheumatic pain, neural pain, sciatica, vertebral pain, improve ... scar after surgery.Usage:Cold compress: put the cold/hot bag into freezer to be refrigerated for half an hour ...