It is filled with bead fiber and its filling is dense. It is a swelling material that does not clump during washing. The outer shell is made of cotton fabric. It is used for dough leavening, yoghurt fermentation and rice brewing. You can preserve meals that cool quickly, such as rice. Machine washable, no fading or sticking. * Dough proofing cover & cushion & puff & overalls * 7 liter volume capacity, 80 cm diameter when opened. This product is produced in our own facility.