Hot Hands Hand Warmers are designed to keep your hands toasty when it's chilly outside. They're rectangular-shaped, single-use, air-activated heat packs that provide up to 10 hours of continuous warmth for hands and fingers. These hand warmers are ready to use. Just open the package, shake it a bit and you're ready to stay warm by holding it or inserting it into gloves or pockets. The average temperature per pack is 135 degrees Fahrenheit. These air-activated heat packs are ideal to use in situations such as tailgating, outdoor winter sports or working outdoors. They come in a convenient 10-count value pack, so the entire family can keep their digits from being cold in frigid temperatures.