The selection of pillows should be based on the following considerations:

1. Sleeping posture: Different sleeping postures require different pillows. People who prefer lying flat during sleep can choose lower pillows, those who prefer lying on their side can choose higher pillows, and those who prefer lying on their back can choose medium height pillows.

2. Material: The material of the pillow is also important. Some people are allergic to down pillows and can choose cotton, memory cotton, or latex pillows.

3. Health: The health factors of pillows also need to be considered. Some pillows may absorb sweat, sebum, and bacteria, so it is best to choose pillows that are easy to clean and disinfect.

4. Quality and Price: Quality and price are also factors to consider when choosing pillows. A high-quality pillow can provide better support and comfort, but the price may be higher.