Feather pillows and down pillows may differ in construction, materials, and price. Feathers make up the coarse outer plumage on birds. Down is the soft, insulating plumage found underneath the feathers. As a result, feather pillows tend to have more structure and support, while down pillows are softer. Down typically retains heat more than feathers, making down pillows less suitable than feather pillows for people who sleep hot. Feather pillows tend to be more affordable than down pillows.