At present, the widely used pillow shapes mainly include the following categories: 1, rectangular (traditional or bread-shaped). Rectangular pillows are flat, also called bread pillows. The middle part is slightly higher, and slowly inclines around to form a plane, which is the main shape used by traditional fiber-filled pillows. The internal filling material is generally soft and has certain automatic forming ability, which can automatically form effective supports with different heights with the indenter. On the basis of rectangular pillow, the quilting technology of lining is added to make the middle concave and the periphery high, which is more suitable for the shape of head and neck. It is a common modeling technique for natural flower pillows. 2, cylindrical. Cylindrical pillow originated in ancient times, and it is still used by some people at present, which mainly has the traction and stretching function of cervical vertebra. Cylindrical pillows are generally aimed at the auxiliary health care of cervical vertebrae, which are not suitable for long-term use during sleep, and are mostly used to decorate the shape of cushions. 3, wavy (B type). Ripple is mainly produced with the application of new materials such as memory cotton and latex and the rise of ergonomics. Because it is a whole piece of material, it can be cut or shaped at will, which can better conform to the human body shape. Its main feature is that it is high at the front and low at the back, forming a B-shaped edge at the left and right ends. On the basis of this model, some upgrades are also wavy. 4. Butterfly pillow. Butterfly pillows and wave pillows are just different in shape. It is also high in the front and low in the back, and the height difference between the front and the back is greater, which can more effectively traction and stretch the cervical spine. The middle part of the front end is concave or protruding forward near the cervical vertebra. The butterfly pillow is shaped like a butterfly, and its main function is to support and fix the cervical vertebra when sleeping on the back. The high energy on both sides is suitable for sleeping on the side. 5. Special shape. In addition to the above four conventional pillows, other unconventional pillows can be classified as special types. There are models that pursue exaggerated modeling and imitate animal and plant modeling, as well as models with special functional structure and ergonomic considerations.