Our Marine Grade Polymer (MPG) collections are made of high-density polyethylene, a durable material that will not swell, rot, splinter, warp, fade or chemically break down when exposed to humidity, water or sunlight. Whether you shop with us for benches, rockers, dining sets or anything else, you can rest assured that it is fully assembled in the USA! We also offer residential warranties from 15 to 20 years!