The Relief PakŪ re-usable cold pack is an effective method of applying cold therapy to a localized area. Place in a chilling unit or freezer. Packs remain pliable and soft even below freezing. Pack maintains its therapeutic level for up to thirty minutes. Chilled pack should be applied to treatment area using either a light towel or a Relief PakŪ cover. Terry covers can withstand repeated machine washing and drying.