Corbeau Sportline Evolution The Sportline Evolution is the newest addition to our Sportline series of seats. When you sit in the Evolution, you'll notice how the strategically placed bolsters hold you in just the right places. Whether you drive on the street, the track, or offroad, you'll notice how the Evolution virtually eliminates body shifting, meaning your body won't get fatigued. Adding to this, the Evolution features our injection molded foam, known as one of the most durable and comfortable foams available. This foam will hold it shape for years to come ensuring your comfort for the life of your seat. Each Evolution seat is hand crafted with our red offset stitching giving the seat and your interior an added look of luxury. The Sportline Evolution is available in black vinyl with a carbon fiber vinyl contrast. The Evolution has a seat base height of only 2.5 inches. That means is if you sit the seat on the floor, the distance between the floor and where you would sit is 2.5 inches. Comparatively speaking this is a thin seat base, which is ideal for minimal headroom applications or for drivers wearing helmets.