What is "UPF" - Definition & Explanation

(Ultraviolet Protection Factor) The UPF rating indicates how effective a fabric is at blocking out solar ultraviolet radiation from reaching the skin. UPF ratings range from 15 to 50 with higher ratings indicating more effective blocking and therefore better protection for the wearer of a garment. Fabrics that test higher than UPF 50 are rated as UPF50+. UPF testing involves exposing a fabric to ultraviolet radiation (UVR) and measuring how much is tranmitted through the sample. Different wave-lengths of radiation in the UVR spectrum have different effects on human skin and this is taken into consideration when calculating the UPF rating. Factors that contribute to the UPF rating of a fabric are:

Composition of the yarns (cotton, polyester, etc)

Tightness of the weave or the knit (tighter improves the rating)

Color (darket colors are generally better)

Stretch (more stretch lowers the rating)

Moisture (many fabrics have lower ratings when wet)

Condition (worn and faded garments may have reduced ratings)

Finishing (some fabrics are treated with UV absorbing chemicals).

Some other terms

Some more terms:

The name given to ultra-fine manufactured fibers and the name given to the technology of developing these fibers. Fibers made using microfiber technology, produce fibers which weigh less than 1. 0...
A weft double knit fabric in which a Jacquard type of mechanism is used. This device individually controls needles or small groups of needles, and allows very complex and highly patterned knits to be...
A rayon that is spun to look like cotton or wool. It is made with staple fibers in a continuous strand to give this effect. It wears well and is washable. Made in different weights and comes in plain...
French for "false" can be anything made to simulate something that it's not. Examples: Faux graining (painting grain lines on figureless wood), faux suede (non-leather fabric made to simulate suede...
pallium a white woolen band with pendants in front and back worn over the chasuble by a pope or archbishop as a symbol of full Episcopal authority; a rectangular cloth worn as a cloak by men of...

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