With a down fill power of 600, the Featherweight Down Womens Jacket is a reliable layer for the winter season. Featuring water-resistant fabric, high quality insulation and easily folds into its own bag, so you can take it on your winter outdoor adventures. Fill 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 insulationThermal - Retains heat for warmth without weightPacks Away - Conveniently packs away into its own pocket. Great for travellers, walkers and moreLightweight - Great for travelling, comfortable to wear and easy to packWater-resistant - Treated with Durable Water Repellent (DWR), droplets will bead and roll off the fabric. Light rain, or limited exposure to rain