UNIQUE 4 HEIGHTS SUIT ALL SLEEPERS: Our neck pillow has four layers to customize your own pillow. You can customize 4 different combinations of layers which create four heights such as 1.2'', 2.4'', 3.6'' and 4.8''. Try to find ''just right'' position to relieve your neck or back pain whatever you are stomach sleepers, side sleepers or back sleepers. WHY SHOULD YOU CHOOSE OUR PILLOW: Don't settle for too soft foam providing no support. It is durable and safe. Say goodbye to neck pain. INNER PILLOWCASE FOR LONGER SERVICE LIFE: Each layer of memory foam is equipped with an inner pillowcase, which can protect the memory foam from being torn while adjusting the side sleeper pillow. It is very convenient to adjust the memory foam neck pillow with the inner case. It can prevent memory foam layers from sticking together. REMOVABLE COOLING PILLOWCASE: Included is a removable and washable cooling cover. You can gently hand wash or dry clean the pillowcase. The soft cooling material provides a cooler sleeping experience than cotton and makes you cool all night. Our neck support pillow has ventilation holes to help alleviate excessive heat build-up. UNIQUE 4 HEIGHTS SUIT ALL SLEEPERS: Our neck pillow has four layers to customize your own pillow. You can customize 4 different combinations of layers which create four heights such as 1.2’’, 2.4’’, 3.6’’ and 4.8’’. Try to find ‘’just right’’ position to relieve your neck or back pain whatever you are stomach sleepers, side sleepers or back sleepers.INNER PILLOWCASE FOR LONGER SERVICE LIFE: Each layer of memory foam is equipped with an inner pillowcase, which can protect the memory foam from being torn while adjusting the side sleeper pillow. It is very convenient to adjust the memory foam neck pillow with the inner case. Our foam expands properly and don't turn yellow after using it for a long time. Beside, each layer of the pillow is protected with an inner case. It is durable and safe. REMOVEABLE COOLING PILLOWCASE: Included is a removable and washable cooling cover. You can gently hand wash or dry clean the pillowcase. The soft cooling material provides a cooler sleeping experience than cotton and makes you cool all night.Our neck support pillow has ventilation holes to help alleviate excessive heat build-up.