Only Hot has come up with a real innovation for anyone craving a long-lasting burst of instant heat. These one-of-a-kind thin, flexible foot warmers are just like a conventional insole, but once opened and exposed to air, they generate a warming heat that lasts up to five-plus hours! Placed in your shoes, they will keep your feet comfortably warm in the coldest conditions. Only Hot Foot Warmers are conveniently packaged and perfect for keeping in a bag for when they are needed. (03/11)