Construction and Parts
Internally, a pillow comprises a filler, often made from foam, synthetic plastic fibers, feathers, or down and viscoelastic foam and latex. Traditionally straw was a filler, but this is uncomfortable and rarely used today. Feathers and down are the most expensive and usually the most comfortable; they offer the advantage of softness and their ability to conform to shapes desired by the user, more so than foam or fiber pillows. One of the disadvantages of a down-filled pillow is that a significant number of people are allergic to them. 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. In India, cotton is also a common filler and is considered to be healthier than synthetic fills.
The fill is surrounded with a cover or shell made of cloth or silk, known as the pillow case or pillow slip. Some pillows 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 standard bed pillow cases usually do not have zippers, but instead have one side open all the time, however, a zippered pillow protector is often placed around standard pillows with the case in turn covering the protector. 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.
Read more about this topic: Pillow
Famous quotes containing the words construction and/or parts:
“There is, I think, no point in the philosophy of progressive education which is sounder than its emphasis upon the importance of the participation of the learner in the formation of the purposes which direct his activities in the learning process, just as there is no defect in traditional education greater than its failure to secure the active cooperation of the pupil in construction of the purposes involved in his studying.”
—John Dewey (1859–1952)
“When the coherence of the parts of a stone, or even that composition of parts which renders it extended; when these familiar objects, I say, are so inexplicable, and contain circumstances so repugnant and contradictory; with what assurance can we decide concerning the origin of worlds, or trace their history from eternity to eternity?”
—David Hume (1711–1776)