The higher the quality of the filling, the lighter the product (approximately 100-150 grams for a waistcoat, 250-300 grams for a jacket, 250 grams per square metre for quilts). In addition, top-quality filling sets more quickly when pressed and does not reveal the rachides (the hard parts of the down) when the hand passes over it. Good cotton or synthetic fabrics should be tightly woven, to prevent both dust from penetrating and feathers from escaping.