The more volume occupied by an ounce of down [cu/in oz], the more air is trapped and the greater the insulation and warmth provided.

In September 2016, “Down Grading Standard” formulated by China and Feather and Down Industrial Association has been put into effect. This standard placed a greater demand on fill power at the basis of down products in accordance with the current national and industrial standards. Fill power can be divided 5 ratings, ranging from A to AAAAA. 

“Down Grading Standard”required that fill power should be shown on product certification tag and washing label, allowing company to link the quality of down products and grand&value. It is convenient for customers to choose different grade of down products.