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What is "Ultraviolet Protection Factor UPF" - Definition & Explanation

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:

A hydrophilic compound applied to a fiber or fabric which results in superior breathability and a moisture management system within the fabric that helps to maintain a comfortable body temperature...
The forced circulation of dye liquor through packages of fibre, yarn or fabric, without limitation of temperature. NOTE: The use of the term "pressure dyeing" in this connection is deprecated. (See...
Usually a nylon/polyester blended yarn that is spun into a microfiber like fabric. It is then brushed twice to achieve the suede touch. The first brushing is applied before dyeing and the second...
Chlorine-free bleaching is the use of hydrogen peroxide to whiten fabrics. Hydrogen peroxide naturally degrades into oxygen and water, leaving no harmful chemical residue on the cloth or in the...
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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