EASY ASSEMBLY. CONTOUR BUILT-IN LUMBAR CURVE IS 2-1/4"" HEIGHT ADJUSTABLE TO PROVIDE FIRM BODY SUPPORT FOR INCREASED EMPLOYEE PRODUCTIVITY. 25 BACK RECLINE INFINITELY ADJUSTS FOR BALANCED POSTURE. PNEUMATIC MECHANISM INSTANTLY CHANGES SEAT HEIGHT TO HELP TAKE PRESSURE OFF LEGS. SEAT BACK ADJUSTS 2-1/4"" IN/OUT FOR ACCURATE POSITIONING OF THE BODY ON THE SEAT. BACK CUSHION IS CONTOURED. ROOMY SEAT WITH FIRM 2"" FOAM CUSHION. PLASTIC SHELL BACK FOR LONG LIFE. COMFORTABLE 12""W X 8""H LOOP ARMS ADJUST 1"" IN/OUT. INCLUDES ARMRESTS.