Two matching Adirondack chairs arrive in one box, so siblings stop negotiating over a single seat on the porch. Each back sits at a 105-degree angle with slats running the full width, letting air pass behind a child instead of trapping heat against a solid panel on a July afternoon. Wood-grain HIPS shrugs off rain and sun, and every joint is fastened with 304 stainless steel screws that will not rust and streak the finish. Reinforced crossbars and a triangular leg structure carry 165 lb per chair for ages 3 to 8.