You know that moment during a long training session when everything starts getting strangely specific? The goggles have already annoyed you twice, your shoulders are tight from the bike, and suddenly your entire mood depends on whether your running shoes cooperate for the next few miles. That is usually when triathletes start caring about comfort that actually lasts. Endurance sports have a way of exposing every weak spot in your gear. If your shoes are too stiff, too heavy, or too hot, you...