Third kits can be a divisive topic. They’re often an opportunity for teams and designers to try something “different,” where “different” pretty regularly means weird or wild. In the MLS era of the Seattle Sounders, third kits have fluctuated from being amped up extensions of the already loud home and away jerseys with the highlighter-colored Electricity and Super Cyan jerseys, and more subtle options that provide greater contrast or a different color like the Pitch Black and Pacific Blue of more recent years.
They haven’t all been home runs, but third kits have been pretty popular in the Puget Sound.