The Ultraboost's reputation among travelers is built entirely on the exceptional BOOST midsole. It provides a uniquely plush yet responsive feel underfoot that is incredibly effective at absorbing the impact of concrete and cobblestones. Traveler communities are filled with reports from users who have walked 25,000+ steps in a day through cities like Rome and Tokyo, claiming their feet felt significantly less fatigued than when wearing other sneakers. The noticeable energy return or 'bounce' helps maintain momentum during those long days. | The main point of contention is the Primeknit upper. While it's soft and adaptive, it creates a very snug, sock-like fit. Many travelers find this secure and comfortable, but a significant number of reports, especially from those with wider feet, indicate that it becomes constrictive and creates pressure points after 5-6 hours of continuous wear. The consensus from seasoned travelers is clear: consider sizing up a half-size, especially if you plan on all-day wear where your feet might swell.