BACK TO BUSINESS. Helping to provide lumbar support as you sit and make short work of your daily tasks at your desk, the contoured plastic back of the Shell Desk Chair also features holes for breathability to help you stay more comfortable during the day. SIT DOWN AND STAY A WHILE. Lined on the seat and arms with easy-to-clean, vinyl upholstered padding, the Shell Desk Chair's seat naturally flexes to fit you, helping to provide some added comfort for those longer workdays. FIND YOUR FIT. Raise and lower the seat height between 17"H and 20"H to find the level that works just right for you. Quickly and easily make adjustments by using the lever conveniently located just below and to the right of the seat. DIMENSIONS. Overall: 26"W x 26"D x 38"H. Maximum Weight Capacity: 275 lbs.