Aluminum frame. Fully 360Degree welded frame, 2.0 wall thickness. Best in class powder coated finish. Fabric 100% solution dyed acrylic. cushions 3 layer heat sealed sandwich construction. 3 inch coresandwiched between 1.25" T22 virgin foam. Allows both sides of the cushion to be used and holds it shape. Back cushions virgin crinkle-form polyfill. Holds its shape longer.