Memory Foam REDUCE NECK & BACK PAIN: The proven curve design supports and aligns your head, neck, shoulders, and back. It prevents your head from rolling out of position, reduces stress on the cervical spine, improves sleep, and relieves neck and shoulder pain, rejuvenating your body. ERGONOMIC DESIGN: Elviros ergonomic pillows are well designed to support by following the natural curve of your body keeps air passages optimal for less snoring and more restful sleep. The cutouts on the side give your top arm a place to rest and keep it at an angle so your shoulder is not hunching over in front of you. TWO HEIGHTS---DESIGNED FOR BACK & SIDE SLEEPING: SIZE 64*(12.5/10.5)*38cm/25.2 x (4.1/4.9)*15inch (L*H*W), Back sleepers with cervical issues can sleep on the higher side (4.9inch) of the pillow with 2 horns as this side provides better support for the head and cervical, so as to keeps your neck properly aligned with the rest of your body. All the other back/side sleepers can sleep on the lower side (4.5inch)