Our standard size 20" width x 12" length x 5" high pillows are made with a new generation of premium, high-density, viscoelastic foamfor pressure relieving of sore neck muscles. This revolutionary material actually reacts to your body's shape itself to the body to evenly weight and pressure. The pillow relieves pressure in your neck/shoulders that can cause poor sleep, tossing and turning, and morning aches and pain. The memory foam yields and gently rebounds for the ultimate in cushioning support. The material relieves the pressure in your neck, shoulders and back, keep your backbone in balance, accelerating your blood circulation for optimum sleeping comfort.