Beauty, Personal Care and Cosmetic Products Design Sidanda Neck Support Square Pillow by Philip Lu Prolonged use of over-high pillows will cause excessive fatigue of the neck, tending to result in stiff neck and other phenomena. Studies have shown that when people sleep on their backs, the suitable height of the pillow for men is 4-8cm, for women 4-6cm, that is, that is, the most suitable height is equal to the heights of their fists. Inspired by this, Sidanda designs this Square Neck Protection Pillow based on ergonomic principles with the suboccipital muscle group as the core, and uses innovative pillow filling methods to provide users with a healthy and comfortable sleep environment.