Outdoor furniture materials, compared honestly

Material is the decision. Everything else about a patio set — the cushion color, the brand, the arm profile, the price — is downstream of whether the thing you bought can survive being left outside. Two chairs that look nearly identical in a photograph can have a fifteen-year difference in service life, and the only reliable way to tell them apart is to know what they are made of.

The trouble is that outdoor furniture listings are written to obscure exactly this. "All-weather resin" covers everything from marine-grade HDPE to the PVC weave that goes brittle in three summers. "Metal frame" means either aluminum, which cannot rust, or steel, which absolutely will. "Hardwood" is doing a lot of work in a sentence where the hardwood is acacia and the comparison being invited is teak.

The five materials worth knowing

HDPE poly lumber is the closest thing to a permanent outdoor material available at consumer prices. Color and UV inhibitors are compounded through the board rather than applied to it, so there is no surface layer to lose. It does not rot, rust, absorb water or splinter. It is heavy, expensive, and effectively finished for life.

Teak is the wood that does not need a finish. Its heartwood carries natural oils and extractives that make it highly resistant to fungal attack without any treatment at all. The catch is grade: a cheap teak chair contains sapwood, which has none of that resistance, and that is where a "teak" chair fails.

Aluminum is the metal that cannot rust. It oxidizes, which forms a protective layer rather than a destructive one. Cast aluminum is heavy enough to stay put; extruded and tube aluminum is light enough to blow over. The variable is the powder coat, and its quality is almost never stated.

All-weather wicker is a weave, not a material — and what it is woven from decides everything. HDPE weave lasts the better part of a decade. PVC weave, which is what the cheapest sets use, goes chalky and snaps. Under the weave, the frame is either aluminum or steel, and that is the second thing to check.

Steel and wrought iron is the heaviest, cheapest and most wind-stable option, and the one that will rust. That is not a reason to never buy it — it is a reason to buy it knowing you have signed up for maintenance.

The comparisons people actually search

Most material decisions come down to a head-to-head, so we have written them as head-to-heads: POLYWOOD against teak is the premium-versus-permanent question, teak against acacia is the one where the price gap tempts people into a much shorter-lived chair, and steel against aluminum is the one that decides whether you will be treating rust in year three.

One correction worth making up front, because the whole internet gets it wrong: POLYWOOD is not a material. It is a brand, and the material it is made of is HDPE. Comparing "HDPE vs POLYWOOD" is like comparing stainless steel to a saucepan manufacturer.