The phrase "standard leather seats" refers to a feature that is included as part of the standard equipment in a vehicle. It means that the seats in the car are made from genuine leather, rather than synthetic materials or cloth. Leather seats are typically more durable and comfortable than other types of seat covers, and they can also add an air of luxury to a vehicle. The phrase is often used in advertisements or specifications for cars to indicate that the car comes with high-quality seating as standard equipment.