Core Products Tri-Core Cervical Pillow Comfort Zone Material MADE IN THE USA, our highly reviewed Tri-Core Comfort Zone, is prized for its ability to help alleviate neck pain and correctly align the spine, while supporting the neck in its natural position. IMPORTANT: If you are new to a cervical support pillow, it may take time to adjust; this is the pillow working to help restore proper cervical curve during sleep. CHOOSE A SIZE: Most adults find the full size size to be appropriate. Smaller framed adults generally find the midsize appropriate. CHOOSE A FIRMNESS: The difference between standard support (firm) and gentle is subtle. The gentle support option contains less fiber, which slightly reduces the height and firmness of the pillow. TEMPERATURE REGULATING: Our most requested fiber support pillow with Outlast Technology, provides better support and lasts longer than traditional pillows.Outlast interacts with your body to help balance temperature by absorbing, storing and releasing heat. NOTE: The center of the pillow is not used for side sleeping. Tri-Core Comfort Zone Full Size Standard, Firm Support 24in x 16in (61cm x 41cm). Outlast cover is breathable, soft and cool to the touch. The hypoallergenic synthetic down fiberfill is resilient and firm. The Tri-Core full size fits a standard pillowcase and is hand washable.