A post for a cab of a vehicle includes an elongated tubular element presenting a tubular element cavity extending longitudinally within the post and an elongated reinforcement element extending in the longitudinal direction of the tubular element along a part of the tubular element, and including a base end and a free end. A tapered portion of the reinforcement element includes the free end thereof being located in the tubular element cavity and tapered in the direction from the base end towards the free end. A base portion of the reinforcement element is at least partly located in the tubular element cavity and extends from the tapered portion to the base end. The reinforcement element presents a smooth transition between the tapered portion and the base portion.