Relief neck pain in just 10 minutes. Normally you will need 1-3 days to adapt to this pillow, because your neck needs time to familiar with the new corrector curvature. You will enjoy an extreme comfort after you get used to it! Simple and effective physical solutions to sooth away stiff neck,helps in restoring proper cervical curvature associated with consistent use.Dense and soft foam design provides sturdy,lightweight, and comfortable base. Can’t be used as an ordinary pillow all night long. (English manual included)