Ignik Outdoors Biodegradable Sleeping Bag Warmers provide reliable, consistent heat for up to 10 hours using natural, biodegradable ingredients. The hand warmers activate when exposed to air and reach full warmth in 5-10 minutes. They are reusable and recyclable with a resealable pouch for controlled use and storage. These warmers are safe to compost after use, reducing waste while keeping hands warm even in extreme cold.