The most sophisticated outdoor lounging system ever produced, MU combines the seating technology, modular logic and more compact proportions of the best indoor systems with the lightness, strength and weather-resistance. With extra-thick cushions and ultra-light Batyline® interior support, the MU 4-seater offers indoor levels of comfort in a sofa light and strong enough for outdoors. Frame: Aluminum Finishing: Electrostatic powder-coated in a color similar to that of the fiber Clean with a soft cloth and warm water. Cushion Maintenance: All cushion covers can be removed and washed.