Cross Sections
	Solid Round
		This is the standard cross section for most synthetic fibers.  It has a minimum surface to volume ratio, but in most cases it is used simply because it is usually less expensive than modified cross sections.
	Hollow
		The hollow cross section has at least one hollow void enclosed within the fiber and running the entire length of the fiber.  Hollow fibers are usually round, but need not be.  They feature: · higher specific surface areas · lower density at the same diameter · thermal insulation properties due to trapped air · higher specific rigidity, so long as the hollow void does not collapse · a delustered (less shiny) appearance. Hollow fibers are generally NOT useful for wicking of aqueous fluids.
	Trilobal
		A trilobal fiber gives a fiber rigidity and resilience, and the many reflecting surfaces are efficient at scattering light to hide dirt.  For these reasons, trilobal fibers are often used in carpets.  The reflective surfaces can also give the fiber a sparkling appearance.
	Ribbon
		A ribbon cross section provides large flat surfaces for specular reflection of light, so its appearance is highly sparkling.  It also has a preferred bending direction, which makes it difficult to card.  If a segmented bicomponent cross section (like a pie wedge) is made with a ribbon cross section, it is exceptionally easy to split into microfibers.
	4DG™
		This highly modified cross section was created for moisture transport, using capillary wicking in its many grooves.  It is the most effective moisture transport fiber commercially available.  Its high surface area and deep grooves also make it highly effective in thermal insulation, filtration, and in delivering materials from its grooves.
	Bowtie
		The bowtie cross section was developed for a side-by-side bicomponent filament yarn that provides gentle stretch recovery.  The cross section optimizes the separation of the centers of mass of the two respective polymers, thus enhancing the stretch recovery of the helically-coiled fibers.

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