Upgraded Neck Stretcher, Neck Hump Corrector, Neck Stretcher Cervical Traction, Ergonomic Neck Cloud, Neck Pillow, Cervical Traction Device for TMJ Pain Relief and Cervical Spine Alignment,Small size and light weight. No matter where you are, you can take neck stretcher with you. Usually you need 1-3 days to get used to this neck stretcher because your neck needs time to get used to the new corrective curvature. (Tips: In order to give you the best experience, please put the product in a ventilated place for 3-5 days to eliminate the smell after receiving the product).