Hi, Scheetz, On a hot day with a blazing sun, nearly any surface will get uncomfortably hot. Lighter colored boards tend to be slightly cooler than darker composite boards. In extensive studies, it has been found that the color of the decking board, regardless if it’s made of wood-plastic composite or wood is the most significant factor in the “heat retention” of the board. In these studies, pressure-treated wood stained the same color as Trex was actually hotter than Trex in the same test conditions.