So Reebok has made a shoe designed for obstacle course racing. It looks like this:
Here's what Reebok has to say about it:
THE REEBOK ALL-TERRAIN SERIES. BUILT SPARTAN STRONG.You're going to go through some water in a Spartan Race, so hey, water drainage is probably a good thing, right? There's a video, too:
Born from the trenches of Spartan Races, the Reebok All-Terrain Series is strategically designed with drainage ports that drain water quickly and easily and 360 degrees of traction to shed mud…..The shoe that can handle any abuse a Spartan can give it so you are unstoppable on any course.