Miami Bistro Stacking sidechair passes ASTM F 1561-96 Class B performance standard for commercial outdoor seating. Rated to 300 pound for safe use in commercial environments. Chair is made of 100% prime resin. U.V. stabilized for greater resistance to sun degradation and changing weather conditions. Glossy and matte alternating stripes further enhance the design of the seat. Extremely durable, easy to maintain, just a wet sponge and a drop of mild detergent will restore this chair to a fresh new look.