These seats are the only ones with tall back rests. Most outdoor seating choices have backrests that come up to the level of your shoulder blades. These ones, though, extend all the way back to allow you to rest your head comfortably for a quick nap.
These seats are manufactured specifically for the outdoors. Dragging your indoor chairs outside will do you no good. Using these pieces is way better for they can endure long exposures to harsh weather conditions.