The Una chair comes in 3 upholstery versions: fabric & leather, mesh and soft upholstery. The aluminium structure comes in three finishes:- polished, chromed or painted. The base is 5-star with castors (soft or hard). Upholstery: Fabric and leather version - flexible and self supporting upholstery in fabric or leather, backrest available in two heights Soft upholstery version - one-piece polyurethane foam padding and upholstered in fabric or leather. Optional tilting mechanism with adjustable tension spring. Mesh version - Elastic and breathable mesh upholstery in various colours.