Most of our metric scores were taken from the experiences we gathered through extensive use of these products by several reviewers. This gear category is more subjective than most, so we wanted to gauge their performance with a wide perspective. We gave them to back, side, and stomach sleepers to gain an understanding of each product's comfort level in different sleeping positions. For support, we considered how much each one flattened out under the weight of an average human head and its ability to keep the head aligned with the spine. We used our own tools to measure the weight and packed size of each pillow, as well as their dimensions when unpacked and set up. We also washed and dried each pillow according to the manufacturers' recommendations as part of our ease of use tests. Overall, these products are top of their class, and each has a unique best application.