You may like the thought of jeans with a worn-in finish, but that look frequently comes at a steep cost. It not only takes a long time to finish jeans (two to three pairs per hour), it frequently involves thousands of chemical formulations. Levi's thinks there's a faster and more environmentally responsible way. It recently introduced Project FLX, a system that uses lasers to finish denim. The technique involves taking photos of the jeans and illustrating them-- the laser then gently marks the jeans based on that illustration to create the simulated wear. This cuts the finishing time from several minutes or more to just 90 seconds, and whittles the number of necessary chemicals down to a "a few dozen."