Steelcase Cobi Office Chair: Arms with Soft Arm Caps - Standard Carpet Casters Designed for quick comfort by automatically flexing and adjusting to your body The chair back's top edge is flexible to allow you to rest your arm on the top of the chair Flexing seat edge encourages you to move and shift; you can sit centered or off to the side Helps keep you comfortable and focused in collaborative settings like conference and training rooms Weight tested up to 300 lbs. with no loss of performance