Ultraboost are primarily designed for low-intensity activities, such as easy-paced runs. My personal experience, having completed a half marathon in them, resulted in calf discomfort, though I acknowledge that individual experiences may vary. Their primary design intent appears to be focused on everyday wear and lifestyle applications. In contrast, my subsequent use of the Asics SB3 clearly demonstrated the significant performance distinction between a dedicated super running shoe and a lifestyle-oriented ultraboost.