3M Nexcare Cold Hot Maxi Reusable Pack N1578G is a large cold/hot gel filled pack is perfect for dealing with pain in large body areas such as back (eg. lumbago), abdomen (eg. menstrual pain) or thigh (eg. bruising). Excellent for those that prefer natural drug-free therapy. The gel is safe and non-toxic to use and also 99% biodegradable which makes the product now more environmentally friendly.