Island Mist is a color option for Trex Transcend® Composite Decking. It is made of high-performance composite material that wont rot, warp, or splinter, unlike wood. The decking is made of 95% recycled materials, with a low carbon footprint. It is backed by 25-year Limited Residential and Fade & Stain warranties.
Ingredients or materials for Island Mist decking are not explicitly listed in the search results. However, the Material Safety Data Sheet for Trex Wood-Polymer Lumber Products states that the plastic used in the decking is obtained primarily from reclaimed sources and is contained in a polyethylene matrix.