Our Adirondack chair with the Patio table is made of hips, and the ranking of impact strength is hips--HDP --eps--wood, we choose higher-level hips with impact toughness is 0.15 n/m, very rigidity, it can let your outdoor Adirondack ottoman durable and sturdy, hips made of plastic and rubber, so it's not as brittle as HDPE, once formed, hips have good stability and abrasion resistant, it will not like wooden chair warp, peel, cracking or rotten, realistic wood grain surface design, look and feel like real wood.