This chair is an absolute marvel! It is so sleek & stylish looking. It is extremely comfortable to sit in. I love all the special features & perks that it has to offer. The seat raises up & down for height adjustment. The arm rests support raises up & down for comfortableness. The back support is featured to give attention to the lumbar area. {It really does}. There is an adjustable headrest & neck support. It is very easy to assemble.  The direction sheet is very easy to follow. Tools you will need are included in the box. I am very pleased with this product! It is well worth your investment. Thanks guys!