Norstar chairs are warranted against manufacturing defects in material and workmanship for six years from the original date of purchase with the following exceptions: Upholstery materials, foam, gas cylinders, wood components, control mechanisms and electronic components. Upholstery materials and foam are warranted against unusual wear or deterioration and gas cylinders, wood components, and controls against structural failure or unusual wear for 18 months. All electronic components for the massaging units have a 90-day warranty period.The warranty obligation is limited to the replacement or repair, at Norstar Office Products' option, of defective parts and components. The warranty of this product is null and void if the product is subject to negligence, abuse, misuse, modifications, accident, or if the customer does not perform the necessary maintenance outline below. The warranty is only rated for the original purchaser of the product and will not be honored if the product is resold. All warranties are for normal usage defined as a forty hour work week by persons weighing 250 lbs or less. The model B205 is limited to 150 lbs.