Internal structure in solid wood and plywood with elastic belt suspension, padded with multi-density polyurethane foam. The backrest, armrests, and seat are upholstered and lightly padded, creating a banded pattern in leather or fabric, joined with double topstitching using a twin-needle technique and featuring light quilting in memory foam. The ergonomic backrests consist of goose down cushions with a micro-perforated back (in the leather version) and rear headrest supports with a magnetic adjustment system. The side/end elements are available in an 'L-shaped' bookcase version on the back and armrest, consisting of a double wooden shelf covered in leather with a marble back panel, or a double veneered shelf in open-pore wood with a leather back panel. The bookcase compartments are finished with satin stainless steel edges and feature diffused LED lighting with a touch control on the armrest. Optional freestanding divider modules are available, featuring leather-covered shelves with satin stainless steel end caps and angular feet in satin stainless steel rod. The metal parts are available in the selection of satin metallic finishes.