Offers supreme comfort with 25 mm thick foam Customization options including swivel, casters, and leg materials Suitable for both dining and working spaces Comes with a 10-year warranty Once you’ve chosen the Harbour Chair shell style that will be cradling and supporting your body, you can now also choose a clover-shaped swivel base so you can spin around as needed – and roll around as wanted, should you opt for castor wheels. The base is available with either swivel or swivel with return options in three finishes – polished aluminum or powder-coated aluminum in black or light grey.