ADJUSTABLE FOR NECK PAIN RELIEF - UTTU pillow features unique adjustable tops for different types of sleepers. Originally with a high circumference of 4.7 inches and 3.9 inches of low circumference, and the middle layer output you will get 3.5 inches of high circumference and 2.8 inches of low circumference. PRESSURE RELIEF - Made of UTU DYNAMIC foam, exclusive premium memory foam, this side sleeping pillow conforms to the natural curve of your body and supports your neck and head for comfort. NEVER GETS HARMFUL - We used UTU Dynamic Foam, which never gets stiff in cold weather. Unlike most memory foam on the market, it stays consistent with a firm and comfortable feel all year round. BREATHABLE COVER - This pillow has a cover made of highly breathable fabric, making it a cooling pad to stay cool all night. The pillow cover is machine washable. PRODUCT DIMENSIONS - 23.6" x 14" x 4.7"/3.9", this cervical pillow is designed to fit different sleeping positions, you can sleep in comfort with UTU whether on your back, side or stomach.