Two U-shaped double riveted cross braces. Features 18-gauge 0.88' round tubular frame. Double hinges for added stability and durability. Unique full size double contoured back and waterfall seat. Fully upholstered seat and back attached with six rivets. Powder-coated frame. Features 0.8 mm vinyl over 1.25-in, 0.9 lb density foam seat and 1.2 lb density back. Color coordinated V-tip stability plugs and polypropylene glides. Vinyl and foam are Cal 117 Rated. Tested by Bureau Veritas to support 500 lbs static load capacity.