ThermaTek is brought to you by the minds of Invintiv. Experience the power of gentle warmth that aids in relieving tension helping to reduce the stress of traveling and provides just the right cozy softness and comfort level. Each ThermaTek pillow and blanket contains a specially placed Heat Zone designed to place heat where you need it. The Heat Zone is powered by an air activated heat pack providing up to 8 hours each of soothing comfortable heat. Heat packs are easy to use - air-activated and provide instant warmth and are safe, ordorless & disposable. Complies with airline security screen restrictions.