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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:

1. Term means 'soft and light' - and was originally used for Japanese waste silk. Fabric is now made in many Far Eastern countries on power looms in plain or twill weave; is heavier than traditional...
The coloring of greige goods or fibers with either natural or synthetic dyes. This may be done in many different ways depending on the type of fabric (or fiber), the type of dye and the desired...
A pinafore apron or simply pinafore is a type of apron worn by women. It originates from "pin afore", reflecting that the bib part of an apron was earlier often secured to the chest using...
Silk, cotton, rayon, or synthetic fibers in a gauze or lino weave that is a very lightweight, open, sheer, or mesh fabric. Wears very well and launders very well. Typically has a swivel dot or clip...
Suede leather with a napped surface. Suede fabric is made from wool, cotton, rayon, synthetics and blends in a plain, twill, or knitted that is napped on one side to resemble suede leather. The...

Companies for UPF:


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