A soft, high-loft, polyester insulation that’s compact, resilient and re-fluffable. Each Hollofil® II fiber features four holes at the core, trapping more air for warmth, even when damp. Softer than solid-core insulations, Hollofil® II is also 20% warmer and conforms to the body shape for greater comfort. Four-hole fibers trap more air and allow greater warmth without added weight. Washable Hollofil® II insulation is odorless, non-allergenic and resistant to mildew and moths.