More Heat, Less Waste. Ignik 8-Hour Compostable, Reusable High-Performance Toe Warmers are made from biodegradable materials, and come in recyclable packaging for more heat, with less waste. Each air-activated, adhesive warmer provides 6-8 hours of heat, while the reusable AirBarrier Pouch, which minimizes air permeability, can save unused warmer heat for up to 72 hours, for intermittent use. Ignik heat is provided by 98 percent biodegradable natural minerals, combined with oxygen, and the contents of the warmers can be composted after use. Ideal for camping, hiking, hunting, snowshoeing, skiing, dog walking, and other cold weather outings, Ignik's ultra-efficient warmers are easily activated by removing them from the packaging and exposing them to air. Each adhesive warmer measures 2.8 x 4 inches, and fits easily inside a boot, shoe, or slipper, either on top of or under the toes. Ignik 8-Hour High-Performance Toe Warmers are available in packs of 10 pairs, 20 pairs, or 30 pairs.