The Radius Task Chair is a sleek office chair with a comfortable, tub-style design that adds a touch of casual elegance. It's stylish and inviting, yet still practical, with adjustable height, swivel, and a choice between wheels or stationary feet. It's a great fit for any modern office.Fixed back and seat cushion.Height-adjustable via a gas lift mechanism.360 degree smooth swivel rotation.5-star base is powder coated steel.Ships with a set of castors and a set of stationary feet. Choose between the two and convert one to the other as needed.Manufactured to meet California TB117-2013 fire safety standards without the use of flame retardant additives in the upholstery foam.All fabric is California TB117-2013 certified and double rub testedANSI-BIFMA Compliant.