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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:

From the French for "cat's eye." The luster of a piece of wood with a finish on it. Also known as luster or depth, chatoyance displays itself by the figure changing with different viewing angles and...
A soft, plush like fabric of wool, usually containing somespecialhair fiber,such as alpaca or mohair. The term isproperly appliedonly to yarnall-woolproduct, closelywoven and of pine stock. Diagonal...
The term comes from the Spanish word toca. A toque is a type of hat with a narrow brim or no brim at all. They were popular during the 13th-16th century in Europe, especially in France. One toque...
a) Any adventitious (unwanted) colour, owing to dye, dirt or iron, on textile material. NOTE: A severe stain is one that will resist processing. b) The fugitive or permanent colouring of material...
A crisp, sheer, lightweight plain-weave fabric, with a medium to high yarn count, made of silk, rayon, nylon, or polyester. The fabric is used primarily in evening and wedding apparel for women. It...

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