Down is the finest insulator that we have. Its warmth to weight ratio, compressibility, long lifespan, and softness are yet to be matched by manmade insulations. Our duck down is DOWN CODEX approved and obtained from one of trusted suppliers. It has a minimum of 700 fill power and a minimum down cluster content of 90%. For further information please see the Down Codex website. For all but the most serious expeditions, duck down is the perfect choice for both insulated clothing and equipment.