Qiviut (pronounced kiv-ee-yut) is an Inuit word commonly used to indicate the wool of the muskox. The word was originally used to refer to the down feathers of birds as well as the inner wool of the muskox. It is valued for its use as a fiber as, unlike sheep's wool, it does not shrink in water at any temperature. (However, this means that it also is not useful for felting.) It is most commonly used for hats and scarves, and is among the softest wools. The muskox has a two-layered coat, and qiviut refers specifically to the soft underwool beneath the longer outer wool. The muskox sheds this layer of wool each spring. Qiviut is plucked from the coat of the muskox during the molt or gathered from objects the animals have brushed against; unlike sheep, the animals are not sheared. Much of the commercially available qiviut comes from Canada, and is obtained from the pelts of muskoxen after hunts. In Alaska, qiviut is obtained from farmed animals or gathered from the wild during the molt. Qiviut is stronger and eight times warmer than sheep's wool, and softer than cashmere or vicuña wool. Wild muskoxen have qiviut fibers approximately 18 micrometres in diameter. Females and young animals have slightly finer wool. An adult muskox can produce four to seven pounds of qiviut a year. Qiviut is produced by the muskox's secondary hair follicles, which are not associated with sebaceous glands, and therefore is a much drier fiber than wool, having only about 7 percent oils. The hair follicle density is very high (approximately 42 per square millimeter) and qiviut is shed in a tightly synchronized spring molting period. The qiviut will loosen from the animal's skin and pull away slightly, creating a "spectacled" look around the eyes and becoming visible all over the body at the surface of the pelt. At this stage of the molt, the undercoat is a short but relatively uniform distance from the skin. This lends itself to combing the qiviut from the animal in a single large sheet. (If not combed, the qiviut will begin to fall out in clumps or be rubbed off by the animal, and may be plucked off the ground or bushes, but qiviut collected this way is of lower quality and requires more cleaning.) After the fleece is removed, it is cleaned by hand, removing vegetation and other foreign matter, and then dehaired. Dehairing is the removal of intermediate hairs (greater than 30 microns in diameter). Dehairing is accomplished by carding as one would cashmere. Mechanical carding can cause breakage and weaken and roughen the qiviut. (Because the pelt is combed rather than shaved, there are very few guard hairs using this method. Pelts from hunted animals are shaved, so the dehairing process in this case is more laborious.) After dehairing, the qiviut may be cleaned again, if necessary. The raw, cleaned qiviut is then spun into yarn and the yarn washed gently in warm water. The yarn may then be overdyed, but bleaching and dyeing can weaken the fiber and reduce its softness.