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:

A weave in which the filling fibers go over many warp fibers before going under a warp fiber, creating the illusion that the fibers are floating, and creating fabric that is very shiny but easily...
A fibre formed by the conjunction at a spinning jet, of two fibre-forming polymers of different properties. NOTE: a) The two components may be caused to merge approximately side by side...
A sock is a baglike covering for the foot and/or lower leg, which is designed to ease chafing between the foot to keep the feet warm and absorb sweat from the feet. Sock lengths vary, from covering...
A plain-weave, stiff fabric with thick-and-thin yarns in both the warp and the filling. The fabric was originally made of linen but is now duplicated in 100% polyester or a variety of blends such as...
a) Threads lengthways in a fabric as woven. b) A number of threads in long lengths and approximately parallel, which may be in various forms intended for weaving, knitting, doubling, sizing, dyeing...

Companies for UPF:

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