When I have looked at the overland, the two strips along the top of the seat bottom (part you sit on - no the sides) did not feel like leather. I did not check the covering of the bolsters on the seatback. I'm hoping it is leather and the difference is due to the ventilation in the middle section of the seat. I asked the salesman and got the deer in the headlights look and a quick response that it is leather.
If the entire surface that touches your body is not leather this is extremely disappointing and falls short of the "luxury" interior jeep is advertising for the overland. Why would they put leather on the dash and vinyl on the seats?
I hope someone that know the facts can clarify this.