Internal structure:Curved fir wood multi-ply.Padding:Sitting cushion:Natural , sterilized goose feathers , memory foam and expanded polyurethanewith different density.Back cushion and arms:Expanded polyurethane with different density.Upholstery:High quality leathers or fabrics available in different categories.External structure , frame and legs:Solid wood legs and structure , available in American walnut , oak orashwood.