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:

General term for a chair with a wooden seat and separate leg assembly and spindle back. Originated in the 17 century around Windsor, England and also popular in America. For other types of chairs,...
Jamdani is a kind of fine cloth made in Bangladesh. Though mostly used for sari's, Jamdani is also used for scarves, handkerchiefs etc. Jamdani is believed to be a fusion of the ancient cloth-making...
Skirt, usually with a great deal of flare. The simple ghaghras have only one vertical seam, which turns the cloth or ghaghra-pata into a tube, fastened with a drawstring passing through a long,...
Single textile material with addition of an extra warp of filling added for weight and warmth. The extra warp or filling ma is of wool, worsted, cotton, or other yarns. This type of construction is...
Color applied to previously dyed color. A process of hand dyeing that works color into the base material. Usually unevenly spaced and vari-colored. Allows the previously dyed color (base color) to...

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