Nan Ya Polyester Down Proof Woven Fabric can prevent down and fill to penetrate fabric.The coating and lamination are the way to get down proof effect, Nan Ya develop the high density cired fabric to get same down proof effect also.Because the high density down proof fabric is not nessary coating or lamination,so the weight can be lower.Nan Ya has 40g/m2 solid dye down proof fabric and 60g/m2 heather down proof fabric.