Seat Mii is the last of the "triplets", which was presented to the world in a practical five-door version. With the debut of each of the three cars with twin structure was shown in three-door version.
Like the Volkswagen Up! and Skoda Citigo, Seat Mii with an additional pair of doors has the same length and course of the roof line at the three-door variant, although the lower window line runs slightly lower. Looks in vain for knob or button for opening the rear window, because the manufacturer decided to unusual solution to the window opens.
Lastly, the boot capacity and is 251 liters, which is exactly what the Seat Mia with one pair of doors. After unfolding the rear seat backs luggage grows to 951 liters.