Active People\\\'s Cosi Cloud Half-Zip Jacket is made of 100% recycled polyester fabric, making it better for the environment. It has duck down insulation with a fill power rating of 600 for retained warmth and extra comfort. It has a water-resistant and breathable outer - ideal for winter weather conditions. Water-resistant - Treated with durable water repellent (DWR), droplets will bead and roll off the fabric. Ideal for Light rain, or limited exposure to rainFill Power Rating 600 - Higher fill power = warmer item. The measure of the loft (fluffiness). The higher the rating, the more air trapped per ounce of down allowing a higher level of insulation