Ergodyne - EGO16992 Made with all-natural ingredients, use the 6992 Toe Warming Packs to protect your toes from harsh cold, hypothermia and frost bite. Warmers retain heat up to 6 hours before replacing. Attach adhesive to your socks for comfortable, long-lasting wear. They fit in any shoe or work boot without adding much bulk. Warmers are easily activated once they are exposed to air so no battery is needed. Conveniently store packs in work bags or jacket pockets thanks to the portable, compact design. Quickly toss away your disposable pack once it has been used. These nontoxic packs to keep you warm and protected in extreme weather conditions while working or even while enjoying recreational activities. Pack includes 40 individually sealed pairs of warmers.