Kia is well known in the auto industry for pushing the boundaries, from everything from performance to design. That means, from time to time, we see Kia release concept models meant to push the envelope in terms of automotive design, both inside and outside the vehicle. Recently, Kia created some such concepts for the Sorento that they are calling the X-Line. Check out our photo gallery of the Sorento X-Line concepts below, and then let us know what you think about them in the comments.