Elchim's 2001 Milano Cocoon Bi-Diffuser is an amazing two piece design that offers a tight fit for ease and use. It offers a perfect Italian design that completely holds to the dryer without falling off even with the most aggressive styling.Close with the top on: Particularly good for fine and thin hair. It allows the user to dry a large area of hair quickly and safely without blowing the hair around. This avoids the challenges that occur of creating split ends and having to cut them off for removal. Open with the top off: This allows for greater air flow to increase drying time. It is particularly good for medium to course hair. This exposes the teeth, allowing the user to add volume and scrunching of the hair. This increases the flexibility of numerous styles. Features: Conical pins with innovative geometry are added for volume, scrunching and fast even drying. Perfect Italian design that completely holds to the dryer without falling off even with the most aggressive styling Manufacturer's warranty (contact manufacturer for details.)