sentences:  High performance composite decking has emerged in recent years to combat earlier generations of composite decking like wood plastic composite (WPCs) that were struggling to maintain credibility in the marketplace.Research is showing now, however, that consumers are choosing composite decking products over wood 11 times to 1.Initial concerns regarding moisture intrusion in composite decks has led to the rise of high performance decking products with protective shells, often referred to as “capped composite decking.”
  
  Capped composite decks have a high performance finish with the addition of the shell that is often called a “cap-stock.” This shell covers either all four sides of the composite board or just the top and sides, depending on the brand.