The shoe fits well and has plenty of support. I ran a 15k with no problems recently. You do not need socks for these shoes, which makes them a great choice for an aquathon. Additionally, for multisport events, the shoes go on in seconds thanks to the easy pull tabs on the tongue and back of the shoe and the innovative lace closure system. However, after 13 miles on the shoe, I managed to break both carbon fiber pieces on the bottoms of the shoe. It is unclear if this is an engineering defect or just a bad batch. I took the shoes back to the store and they were just as perplexed as I am.