Features and Benefits:12 in x 12 in.- Fits perfectly in the Mr. Heater portable seat cushion; Warms up to 5 hours; Air activated; Disposable; All natural Ingredients; OdorlessMr. Heater brings you comfort ‐ in the quality and the warmth their product provides. Mr. Heater disposable seat warmers are made of all natural ingredients that generates over 7 hours of continuous heat when exposed to air. The odorless pouch fits perfectly in the Mr. Heater Seat Cushion and is perfect for sporting events, hunting, and traveling. Experience the warmth and comfort only Mr. Heater can provide!