Hardness: hard pillow and reduces the contact area of the pressure increase skin comfortable pillow soft hard to keep constant height lead to neck muscle fatigue influence respiration is conducive to sleep loss can reduce the hardness of soft pillow set to maintain a uniform pressure and pressure between the skin blood circulation pressure is through the appearance and early use of pillow pillow off early to soft and hard and pay attention to adjust the angle of free. Shape
Height: the supine sleeping can keep the neck pillow supine or lateral occipital and arc height of 15 cm high pillow should say popular worries actually nothing that cervical in lordotic neck soft tissue tension, fatigue easily with long neck pillow made of bone morphology change and anti bending straight, a low pillow pillow sleep or make love easy to cause of congestion and edema of face and jaw to lift the eyelids to mouth breathing, snoring
Temperature: the temperature of a 34 - to sleep more than 34.5 degrees Celsius temperature to several degrees lower temperature is high in the same latitude with season and fall asleep with cool pillow, warm pillow pillow with difference like summer often choose to meet the pillow mat area order department to maintain good sleep temperature characteristics
