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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. 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. Some pillows often have a fancier cover called a sham which is closed on all sides and usually has a slit in the back through which the pillow is placed. Rectangular bed pillows usually do not have zippers, but instead have one side open all the time. It is recommended that all types of pillow covers be laundered periodically since they are the part that is in contact with a person's body. But 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.
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