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  2. Down feather - Wikipedia

    en.wikipedia.org/wiki/Down_feather

    The down feather is considered to be the most "straightforward" of all feather types. [2] It has a short or vestigial rachis (shaft), few barbs, and barbules that lack hooks. [3] There are three types of down: natal down, body down and powder down. Natal down is the layer of down feathers that cover most birds at some point in their early ...

  3. Feather development - Wikipedia

    en.wikipedia.org/wiki/Feather_development

    Feather development occurs in the epidermal layer of the skin in birds. It is a complicated process involving many steps. It is a complicated process involving many steps. Once the feathers are fully developed, there are six different types of feathers: contour , flight , down , filoplumes, semiplumes, and bristle feathers.

  4. Down jacket - Wikipedia

    en.wikipedia.org/wiki/Down_jacket

    A typical, modern, hooded down jacket featuring seamless quilted pockets filled with down. The down jacket, known more commonly in the fashion industry as a puffer jacket or simply puffer, is a quilted winter jacket which is insulated with either duck or goose feathers.

  5. Feather - Wikipedia

    en.wikipedia.org/wiki/Feather

    Down feathers are fluffy because they lack barbicels, so the barbules float free of each other, allowing the down to trap air and provide excellent thermal insulation. At the base of the feather, the rachis expands to form the hollow tubular calamus (or quill) which inserts into a follicle in the skin. The basal part of the calamus is without ...

  6. Let it be: Zverev surprised when a feather delays play ... - AOL

    www.aol.com/zverev-complains-feather-delays-play...

    Alexander Zverev was bothered by an officiating call caused by a bird’s feather during his quarterfinal win over Tommy Paul at the Australian Open. The second-seeded Zverev was down 4-2 in the ...

  7. Fill power - Wikipedia

    en.wikipedia.org/wiki/Fill_power

    Fill power is a measure of the loft or "fluffiness" of a down product that is loosely related to the insulating value of the down. The higher the fill power, the more air a certain weight of the down can trap, and thus the more insulating ability the down will have.