Frames are craftsman-built using cross-directional hardwood laminate certified by the Sustainable Forestry Initiative. Selected from the highest quality hides in the world, our artisan-crafted leathers are dyed and finished by hand to accentuate their natural colors and preserve their unique features. Frame support system features a no-sag Flexolator suspension made from recycled steel. Seat cushion contains dense foam made from partially plant-based material, padded with poly fibers. Backrest is filled with a supportive blend of foam and poly fibers and back frame system is sustained by flexible sinuous springs. Swivel mechanism made from solid steel rotates 360 degrees. We want you to love your Ellison as much as we do. We recommend ordering a swatch prior to purchase, ensuring the perfect color choice.