A chair (1), including a seat (5), wherein the seat (5) includes a barrier zone (10) dividing said seat (5) into a front seat portion (15) and a rear seat portion (20), said rear seat portion (20) being of a material more easily deformed than said barrier zone (10), such that in use, movement of the user's buttocks from said rear seat portion (20) towards said front seat portion (15) urges the rear seat portion (20) towards said barrier zone (10), deforming said rear seat portion (20) and inhibiting said buttocks from moving towards said front seat portion (15).