Ignik 24-Hour XL Warmers 1 pair. We start with the highest quality naturally active ingredients. The contents are safe all-natural and biodegradable. Our Patent Pending AirBarrier pouch keeps more air out for more reliable heat - up to 24 hours each more heat than the leading brands. The resealable top gives you control to use the warmers when you need them. Store unused open warmers for up to 72 hours later. The outer pouch is re-usable and 100percent recyclable. The end result is a higher performance warmer which is more efficient and less wasteful. They are simple to use. Open the bag take out a warmer and give it a shake. The air will activate the warming agents and in 5-10 minutes the warmer will be giving off a nice heat. Place your XL warmer close to your body or wherever you might need extra heat. Our safe natural air-activated warmer keeps you warm even in extreme cold. Best of all they are 98percent Biodegradable. When you are finished just cut the warmer sack and compost the natural chemicals inside. They make great fertilizer Specifications for Ignik 24-Hour XL Warmers: Manufacturer: Ignik Application: Outdoor Size: 4 x 5 in Gender: Unisex Age Group: Adults Fabric/Material: Vermiculite Natural Materials Salt Iron Seasonal/Temperature Use: Cold Weather Weight: 136 g 0.3 lb Heat Duration: 24 hours Features of Ignik 24-Hour Biodegradable Sleeping Bag Warmers w/Reusable AirBarrier Bags Safe comfortable air-activated warmer made from natural ingredients. Contains (2) 24-Hour warmers one for your feet and one for your torso. Patent-pending temperature regulation envelope lets you save one for the next day or use partially then re-seal and save for the next night. 98percent Biodegradable. Contents can be composted after use. Package Contents: Ignik 24-Hour XL Warmers Ignik IGAIR-00221PR: 24-Hour XL Warmers 1 pair