Getting the Right Fill
The most common fill materials are down, polyester fibers, and foam. However, wool, cotton, and latex are also available. The type of fill will determine the supportiveness and comfort of the pillow. For the most part, finding a good fill material is a very personal decision–try resting on a few in the store before you decide to buy. When trying out different pillows, be aware of any allergic response you have to materials. Also see if the pillows give off any odor initially, as this could be a sign of chemical outgassing. This isn’t just an issue with synthetic materials, it might also be due to cleaning or processing of natural materials.
And don’t forget to check pillows for heat retention. Rest on the pillow for a few seconds, then lift your head up and feel how warm the spot is. A pillow that retains more heat will lead to sweatier nights.
Some pillow manufacturers promote numbers like “fill power” to convince you that their pillows are higher quality and will last for longer. Don’t believe these claims unless the manufacturer backs them up with a good warranty or numerous customer reviews support the claim.