A highly adaptable executive office chair with adjustable headrest and 3D adjustable arms; ergonomic design approved by certified physiotherapist Generous seat, back and headrest in a comfortable, supportive, breathable mesh fabric; lock tilt mechanism to help you find the most comfortable sitting position The tilt of the chair can either be locked in an upright position or left to free float with the user, whichever is the most comfortable; the torsion control knob is an important feature which means that the tilt tension can be adjusted to suit the user's body weight Five years component and two years fabric guarantee; conforms to BS1335 (2000) Part 2 and UK fire retardancy regulations for users up to 115 kg and up to eight hour daily use Dimensions (W x D x H): 67 x 65 x 115 to 124 cm; seat height 45 to 54 cm, seat depth 51 cm, seat width 50 cm, back height 75 cm with back width 51.5 cm, arm height 64 to 72 cm