ThruFlow Legacy XP panels assemble with connecting tabs and elongated screw holes. Because of their open architecture, the UV-resistant, non-slip panels are lighter in weight than other decking products and allow sunlight to pass through, which the manufacturer says keeps the decking surface cooler. Medium-strand-glass-fiber reinforcement and a thick rib structure below help the polypropylene panels withstand greater loads. The panels are available in 1-by-3-foot, 1-by-4-foot, 1-by-5-foot, and square 4-foot-by-4‑foot sizes and in light gray, maple, and sea foam hues.