Lavabuns are revolutionary new cushions that retain heat for up to six hours. Simply remove Microcore element from Lavabuns and microwave for three minutes on both sides and you've got a super comfortable heated seat that will keep you warm where it counts. Great for sporting events, fishing and many other leisure pursuits. Lavabuns are easy to use, lightweight and durable. It folds into a convenient carrying size, fastens with a velcro closure, and goes where you go! Its cover also resists stain and water. Lavabuns are not just another seat, is's the best way to stay comfortable, dry and toasty warm. Lavabuns can also be chilled for cool comfort. For best results, leave overnight in the refrigerator.