Sturdy 0.87' square-tube 18-gauge steel frame with 0.62' under seat and H-Braces. Waterfall seat, padded with 2' of 1.8 lb high-density Grade A foam with double-stitched box seat. Features a concealed double back with four covered metal tabs for a more refined look. Built-in stack bar and 12 plastic stack bumpers help prevent wear and tear. MDF core seat and back. Rocker glides. Tested by Bureau Veritas to support 500 lbs static load capacity. Made From Rugged 7/8' Square 18-Gauge Steel Tubing Superior Frame Strength With 5/8 Under seat Brace And H Brace Waterfall Seat, Padded With 2' Of 1. 8Lb. High-Density Grade A Foam With Double-Stitched Box Seat