elite Ultramarathon's shoes

Just when I thought TNF Arnuva 50 BOA was a good choice for ultramarathoners, I was quite surprised when I read about Valmir Nunes's record breaking win at this year badwater ultramarathon, to found that both he and previous death vallery record holder, Scott Jurek, are brooks runners and they both used Brooks Racer STs for their ultramarathons record breaking wins. Who say racers are only for short distances?........................................ BROOKS: Run World, Run