Since the late 1980s, manufacturers have introduced dozens of wood-plastic composite decking products, including composite boards with thin plastic caps (i.e. capped composites) in recent years. Composite decking manufacturing methods vary, resulting in deck boards with significantly different performance characteristics. Several composite brands have experienced field failures, but newly advanced products are proving promising against demanding exposures. Specifying durable and attractive composite decking requires attention to key physical traits, including moisture absorption, and insect resistance.