Lava Buns Portable Seat Cushion with Microwavable/Freezable Gel Packs Lava Buns can be heated in the microwave or cooled in the refrigerator or freezer to provide a comfortable climate controlled cushion wherever you may need it. Perfect for spectator events, golf carts, camping, driving, or whenever you need a little warming up or cooling off. Unit measures 12" H x 17" W. Includes 2 Reusable Microcore Element gel pack inserts that stay hot for up to 6 hours or cold for up to 4 hours. No electric cords or plugs. Makes a great cordless heating or cooling pad to use for your back, neck or other areas. Made in the USA.