These chairs are weather resistant, rust & maintenance free with a smooth & silky finish. They are rust resistant due to the special coating on all metal surfaces. There are 3 stages of preparation to the solid steel frame. First is a layer of ground phosphate which cleans the steel & prevents oxidation. Secondly, an adhesive primer allows the 3rd stage to stick to the frame evenly. Lastly, the frame is dipped into a hot melt powder, creating the smooth finish. The mesh design allows water & other liquids to go straight through, so not pooling on the chair. The chairs are also stackable so can be stored away when not in use. You also get a cushion for greater comfort.