Active People\\\'s Cosi Cloud Gilet is made of recycled polyester fabric, making it better for the environment. It has a down filling for retained heat and it has a water-resistant outer to keep you dry in light rain showers. 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