Sun, sea, sand and salt a problem? Not for DockSider. This composite decking plank stands up to all the elements that come with docks, marinas, pools and other near-water applications, and even heavily used public places like boardwalks, theme parks, stadiums and universities. DockSider is rot and warp resistant and splinter-free, with a unique 24-inch on-center span, which is great for commercial applications.