The Comfort Zone pillow delivers the same neck support as a traditional Tri-Core pillow with the added benefit of Outlast® technology. Outlast interacts with your body to help balance temperature by absorbing, storing and releasing heat. Traditional pillows trap body heat and prevent your body from cooling down. The Comfort Zone pillow manages that buildup of heat and allows you to maintain a more balanced temperature. No more kicking off covers or waking up chilled. Measures 24” x 16” (61cm x 41cm); Mid-Core measures 22” x 15” (56cm x 38cm).