Imagine owning outdoor furniture that you don't have to spend your time maintaining. Just set it outdoors and enjoy using it. That is the major advantage of poly outdoor furniture. Poly Lumber is a high density polyethylene (HDPE) plastic derived from post-consumer waste such as milk jugs and plastic packaging that would otherwise end up in a landfill. This material is then cleaned in a decontamination process to a high purity level. This purified recycled plastic is formulated with Ultra-Viol.