I have been working at my desk, and my cervical vertebra hurts. Be especially careful when twisting your neck. I spent more than 400 yuan on two Neumann brands. It has been used for 8 months, and now it is getting better. I have no previous symptoms and sleep better. Mainly, this pillow supports the neck, ensures smooth blood flow and reduces neck muscles.
This Neumann pillow is said to be chosen by astronauts in the space capsule, so it is more expensive. The prices of other brands are still relatively low. This kind of pillow seems to have a shelf life of two years. Maybe it's too long to remember. Sponges have no elasticity.