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:

Obstructive airway disease in people who work with unprocessed cotton, flax, or hemp; caused by reaction to material in the dust and thought to include endotoxin from bacterial contamination....
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Moccasin is a native American word, and means a shoe made of deerskin or soft leather. It is made in one piece; the sole is soft and flexible and the upper part is often adorned with embroidery,...
Head coverings during the 16th century ranged from the simple to the complex. The simplest, which was worn throughout the 16th century and well into the 17th, was the "coif". The coif is, quite...
The process of dyeing fiber prior to formation into yarns. Very high fastness dyes can be used and there is less pressure on getting color exactly right since batches can be blended prior to yarn...

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