Since 2019, all Mirages have a 6-way driver's seat in the States. Prior to that, it wasn't a part of the base models.
It's a marketing term. Let see for a Mirage it would be entire seat moved forward, entire seat moved back, tilt rear of the seat back, tilt rear of the seat forward, extra two are the ability to lift the seat up & down some.
If you are somewhat tall, I find the extra feature useless. My head is close enough to the roof already, & I am not convinced a 6-way manual adjustment does much in helping that. I would never use it. It was a non-factor in buying a Mirage for me.
I do have neoprene custom made seat covers for the front seats. They have been holding up quite well! Made by Dash Design (best price is usually @ rockauto.com).