Don’t “Bundle Up”…“Bundle Off” with Thaw's disposable body warmer. Thaw's special blend of natural ingredients activates when exposed to the air to heat up quickly and safely up to 158ºF and provide over 20 hours of heat. These large warmers are a great size to put into a coat pocket to provide a long-lasting warmth for your body. Use them all day and when the heat runs out, simply throw them away. Don't let cold stand in your way with the THAW disposable body warmers.