Composite materials are made from two or more constituent materials that produce unique properties. Wood is a natural composite of cellulose fibers in a lignin matrix, while concrete is a composite of aggregate, cement, additives and water. Composites provide advantages like light weight, design flexibility, high strength, corrosion resistance, toughness, durability and cost effectiveness. They are extremely durable, impact resistant, have a high strength to weight ratio and provide insulation properties. Composites have applications in building construction materials like the headquarters of D.R. Horton builders, which was constructed entirely of fiberglass.