Beanie

A close-fitting, brimless cap, usually knitted from wool or another warm material. Its simple construction and snug fit make it useful for warmth and everyday wear.

Knitting: A method of making fabric by interlocking loops of yarn with needles or machines. Most beanies are knitted, and the looped fabric gives them stretch and warmth.
Thermal insulation: The reduction of heat transfer between objects or regions at different temperatures. A beanie limits heat loss from the head by trapping relatively still air.
Watch cap: A close-fitting knitted cap traditionally worn by sailors and other watchkeepers. The watch cap is a classic beanie design associated with cold-weather duty.
Beanie (cap): A soft cap with a rounded crown and a stiff projecting brim. Its brim and structured shape distinguish it from a brimless beanie.
Wool: A natural animal fiber, most often shorn from sheep, used to make insulating textiles. Wool is a traditional beanie material because its fibers retain warmth.
Conduction: Heat transfer through direct contact between particles or materials. The beanie’s fibers and trapped air slow conductive heat flow from the scalp.
Toque: A close-fitting knitted cap, especially in Canadian usage. Toque is a common regional name for a knitted beanie.
Hip-hop fashion: Clothing and style practices associated with hip-hop culture and its communities. Beanies became a recognizable option within several hip-hop styles.
Rib knit: A knitted fabric pattern of alternating raised ribs and recessed channels that stretches readily. Rib knitting commonly forms a beanie’s stretchy body or folded lower edge.
Convection: Heat transfer through the movement of a fluid such as air or water. A snug beanie reduces air movement near the head, limiting convective heat loss.

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