Height Adjustable--the strap to set up the pillow is elastic. The elastic strap is also designed to be length adjustable. You can simply move the buckle on the strap from one end to the other end and you can stop the buckle at any position you want in order to achineve the length you desire, which means you can set up the pillow at any heights you desire as long as you adjust the strap length. If you find a ceratin height that supports you the best, you can pin the length to make the pillow atttach onto your car headrest tightly. Thickness Adjustable---we make the zippers on the pillow case and the pillow inner bag to ensure that the pillow thickness can be adjusted by you, and we provide the extra separate filling bag in case you want to make the pillow thicker and firmer. You can take some fillings out from the pillow if you think it's too thick or firm for you. The Most Distinctive Feature: With the upgraded strap, this neck pillow after being set up, its height can be