Soft breathable fabric, dust-proof and washable; Pack of 3 dust proof bag and dust cover, small size measurement: 12 1/2*15 3/4 inches, medium measurement: 15 3/4 * 19 2/3 inches, large measurement: 19 2/3 * 23 2/3 inches; Perfect for organizing and storing unorganized items such as off season clothing, shoes, accessories, pack luggage, sport bags, purse or even backpacks,toys as a protective bag;