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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 heavy, soft cotton material with a napped finish, usually only on one side. In cheaper qualities the nap comes off. Launders well, easy to manipulate and is warm to wear. There are many types on...
A frame in which a large number of healds are mounted. Typically a loom contains two or more heald shafts, depending upon the complexity of the weave pattern required. The heald shaft is raised or...
Grommets and eyelets are metal, plastic, or rubber rings that are inserted into a hole made through another material. They may be used to reinforce the hole, to shield something from the sharp edges...
A finish achieved with engraved rollers which press the design into the fabnc. causing the crushed and uncrushed parts to reflect light differently (called "Water-Marked'". Sometimes it is done with...
A design effect created on a woven fabric by the use of extra yarns which are woven into the fabric at a certain spot then allowed to float over the fabric to the next spot. The float threads are...

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