Pillow for all

      Internally, a pillow comprises a filler made from foam, synthetic fills, feathers, or down. Traditionally straw was a filler, but this is uncomfortable and rarely used today. Feathers and down were the choice of the rich; these offered the advantage of softness and their ability to conform to shapes desired by the user, more so than foam or fibre pillows. However, the pointed tips of down feathers can poke through the pillow cover, poking the sleeper and causing discomfort, and so today even they have become less common than foam-based pillows. There are currently hypoallergenic varieties of down pillows to allow people sensitive to down to enjoy the comfort of feather or down pillows. In Asia, buckwheat is a common filler, as are plastic imitations. Such pillows tend to be smaller than a standard pillow.

      The fill is surrounded with a cover or shell made of cloth or silk, known as the pillow case or pillow slip. House pillows (also called cushions) often include a zipper in this cover so that the fill can be removed and the covering laundered. Bed pillows do not have this feature, and instead a pillow case goes over the pillow, that can be washed. Even with regular washing, pillows tend to accumulate large amounts of dust and vast numbers of microbes among the fill and it is recommended that they be replaced every few years, especially for those with allergies.

      The classic bed pillow shape is a square or golden rectangle with four corners reminiscent of the shape of the ears of a cat. Each corner of a pillow is referred to as a nib. When a pillow is placed on a flat surface the "poof point" is the crest of the pillow roundness.