【Latest & Comfortable Ergonomic 3D Pillow】3D Neck Support System: The ergonomic design firmly supports the neck. The recessed, arched hollow structure fits perfectly to the curve of the shoulder, forming a natural arch just by resting your head, providing a feeling of being enveloped. It provides stable support while reducing pressure on the head. Also, the pillow has a moderate firmness and size, providing a sense of security for a comfortable sleep experience. How to open the pillowcase: Pinch and pull the button in the center to open, and fasten the ends with buckles. The pillowcase can be removed and washed. 【Comfortable Even When Sleeping on Your Side, Design to Insert Arms】The arched design on both sides allows your arms to fit along the curve when sleeping on your side or back, providing natural support. You won't have trouble finding a place to put your hands. This is a low-rebound pillow that allows you to sleep comfortably in any position: on your side, back, or stomach. 【Low-Rebound Quality Memory Foam Material】This comfortable pillow uses high-quality memory foam material, which evenly distributes pressure on the head, neck, and shoulders during sleep, reducing fatigue and providing ideal sleep comfort. It adopts high-density filling technology and has excellent elasticity and stability, making it less likely to sag compared to conventional low-rebound pillows, and creating a comfortable sleep environment that is less affected by temperature. 【Pillowcase for Comfortable Sleep】The black, high-grade mesh pillowcase is made of innovative Polyester fiber high-density material, providing a soft and comfortable feel. The breathable side aerodynamic mesh design provides a refreshing and comfortable sleep environment. In addition, the pillowcase has excellent elasticity and flexibility and fits perfectly to the pillow body. 【Freely Adjustable Height Design】The lower side is 7cm and the higher side is 12cm, and you can easily adjust to your preferred height just by changing the orientation of the pillow. Whether you prefer a low pillow or a high pillow, this pillow meets both needs. Pillow, Doesn't Hurt Neck, Low-Rebound, WB, Pillow, Low-Rebound Pillow, Adjustable Low/High, Sleep Pillow, Three-Layer Structure, Side Sleeping, Back Sleeping, Stomach Sleeping, Neck Pain/Shoulder Pain Relief, Brain Rest, Breathable, Washable Cover, Father's/Mother's Day/Husband, Respect for the Aged Day, New Year's Gift, Birthday Present, White & Black