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Glossary
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UHMWPE:
ultra-high molecular weight polyethylene.
Last referenced in: Global apparel markets: product developments and innovations, 4th quarter 2013 (Global Apparel Markets Issue 24)

ULPA:
ultra-low penetration air (filtration).
Last referenced in: The world nonwovens industry: 20 medium sized producers, part 2 of 3, 2013-14 (Technical Textile Markets Issue 95)

Ultraviolet protection factor (UPF):
a measure of the amount of protection against ultraviolet radiation to human skin provided by an item of clothing. UPF is similar in concept to the sun protection factor (SPF) which is used to categorise sun creams and lotions. However, SPF is more precise.
Last referenced in: Profile of Craghoppers: a leading supplier of world travel and adventure clothing (Performance Apparel Markets Issue 48)

Ultraviolet stability (geotextiles):
the ability of a geotextile to retain strength upon exposure to ultraviolet light over a specified period.

Unit production systems:
an advanced apparel manufacturing system in which a single garment is progressed through a sequence of operations. Using a unit production system, a garment is automatically transported via a computer-controlled overhead hanging system, which has been ergonomically designed to reduce the amount of handling of the garment (see also progressive bundle system).

UPF:
ultraviolet protection factor. The UPF of a fabric is defined as the amount of UV radiation transmitted through air divided by the amount of UV radiation transmitted through the fabric. A UPF rating of 100 indicates that 1/100th of the UV radiation which hits the fabric can reach the skin.
Last referenced in: Profile of Craghoppers: a leading supplier of world travel and adventure clothing (Performance Apparel Markets Issue 48)

UPS:
see unit production systems.
Last referenced in: Trade and trade policy: leading clothing suppliers to the USA (Global Apparel Markets Issue 2)

Uptwisting:
a system of twisting one or more yarns by withdrawing them over-end from a rotating package. Uptwisting forms the second stage in two-stage twisting.

UV:
ultraviolet.
Last referenced in: Profile of Craghoppers: a leading supplier of world travel and adventure clothing (Performance Apparel Markets Issue 48)

UVA:
UVA (alpha) is long-wave UV (ultraviolet) radiation which penetrates deep into the skin. UVA radiation ranges from 315 to 400 nanometres (nm) in wavelength, and is known to cause skin cancer, skin blotching, wrinkles and premature ageing of the skin.

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