PrimaLoft® is a patented ultrafine microfiber blend that is incredibly soft, lightweight and water repellent. PrimaLoft® synthetic insulation absorbs three times less water, is 15% warmer when dry and is 24% warmer when wet that the closest competitive insulation. In addition to these impressive thermal properties, PrimaLoft® is lightweight wiht a down-like softness that adds comfort and appeal.