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U.L. Down
Ultra Light Down is used in women's and men's jackets. the concept is to make the lightest and warmest insulation layer available. U.L. Down jackets weigh less than a tee-shirt, blocks more wind, is warmer than even the
heaviest fleece jackets, and compress to the size of a water bottle. This outerwear can be used when warmth is critical, minimal weight is paramount, and space is at a premium.
Ultra-Light Weight
Term used to describe a fabric used in outerwear, which allows for a minimum pack volume and weight. Lightweight packable garments offer the most versatile weather protection. Some of these fabrics have a protective layer on the membrane, which provides durability. This means that the garments made from extra lightweight fabrics need no separate lining.
Ultrasuede
An imitation suede fabric composed of polyester micro fibers combined with
polyurethane foam in a non-woven structure. Hand and appearance resemble sheep
suede.
Under-press
To press the underside of a garment section during manufacturing to open the seams and give it shape.
UPF (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
transmitted 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 (darker 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)
UV Degradation
The breaking down of fibers or fabrics when exposed to ultraviolet rays.
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