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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:

Rupture of individual filaments (usually during winding or weaving) that results in the appearance of a fibrous or hairy surface, which may be localised or general, in a fabric made from flat...
A hard-finished, low lustered, medium-weight fabric in a twill-weave construction. It is most commonly found in men's worsted suitings; however, it can also be found in a plain-weave construction of...
Descriptive of yarn spun wholly from combed wool inwhich the fibers arereasonably parallel ,and fabrics orgarments made fromsuchyarns. In mostcountriesfabrics with a small proportion...
A Lightweight, Plain Weave, Crepe Fabric With A Pebbly Texture And Slightly Raspy Hand. Uses High Twist Yarns Which Alternate Between S And Z Twist Every Thread Or 2 In Both Warp And Weft . Used For...
An open fabric of silk, rayon, cotton, synthetics, or nylon, that is created by connecting the intersections in a woven, knitted, or crocheted construction to form a mesh-like appearance that won't...

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