The Aeron chairs comes in 3 different sizes:

Size A is best suited to people of up to 5’2 in height
Size B is best suited to people between 5’2 and 6’3 in height
Size C is best suited to those over 6’3 in height

Dimensions of the Aeron chair

Size A (h 104cm x w 65cm x d 40cm)
Size B (h 108cm x w 68cm x d 43 cm)
Size C (h 114cm x w 72cm x d 43cm)