PrimaLoft is a patented synthetic microfiber thermal insulation material that was developed for the United States Army in the 1980s. PrimaLoft is a registered trademark of PrimaLoft, Inc., the brand’s parent company.
The original patent filed for PrimaLoft insulation, known as “Synthetic Down” and filed in May 1986, describes a particular mix of synthetic microfibers and macrofibers that compares favorably to down.[8] It was proven to provide an equally efficient thermal barrier, be of equivalent density, possess similar compressional properties, have improved wetting and drying characteristics, and have superior loft retention when wet.[9] The latter point illustrates PrimaLoft’s primary advantage over down. Unlike down, PrimaLoft is able to retain 96% of its insulating capability when wet by maintaining its loft, and therefore is used in clothing and equipment intended to be used in cold, wet conditions, such as jackets, parkas, gloves, sleeping bags and footwear.
River Valley Breakdown Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
http://creativecommons.org/licenses/by/3.0/

source