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~300 km
Expected lifespan, based on hand-researched wear data for this model.
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Durability is a standout feature, with reviewers highlighting the thick ASICSGRIP outsole rubber and minimal wear after over 120 km. The FlyteFoam layer adds to the shoe's longevity, making it suitable for both training and racing.
The Asics S4 is designed primarily for marathon and long-distance road running, targeting runners aiming for sub-4-hour marathon times. Experts consistently highlight its firm, stable ride, substantial cushioning, and durable outsole, making it highly suitable for long runs and marathon training, especially at moderate paces (around 9:00–10:00 min/mile). The shoe's stability and carbon plate provide a snappy toe-off, supporting tempo efforts, but the firm midsole and moderate energy return make it less ideal for faster racing or those seeking a highly responsive 'super shoe' feel. For daily training, it is serviceable but not as comfortable or soft as dedicated daily trainers, and most reviewers prefer softer shoes for easy or recovery runs. The S4 is not designed for trail use, lacking the traction and flexibility needed for technical terrain.
Ideal for Best suited for intermediate to experienced runners aiming for a sub-4-hour marathon, who value stability, durability, and a controlled ride over maximal softness or elite-level propulsion. Ideal for those who prefer a firmer, more traditional feel in a plated shoe and need reliable support for long-distance road racing or steady training.
The S4 was designed for sub-4 hour marathoners, prioritizing stability and safety over maximal bounce. The fit is more forgiving and stable than elite super shoes like the Metaspeed Sky/Edge, making it suitable for a broader range of runners. The shoe feels stiff and firm out of the box but softens and becomes more flexible after break-in. The S4+ Yogiri, the updated version, maintains these characteristics and is now available outside Japan.
Sizing: Generally true to size; no widespread recommendations to size up or down. Fit is designed for the average marathon runner, not as narrow as elite models.
Long Distance shoes in NORMA's database last between 300 and 900 km across 71 models. At 300 km, the Asics S4 sits in the lower half of that range.
The ASICS S4 is engineered for marathoners targeting the sub-4-hour mark, blending a stable, firm ride with a responsive carbon plate and durable outsole. While it excels in stability and controlled pacing, its firmer feel may not suit those seeking a highly cushioned or energetic super shoe experience.
Full specs, fit notes, and reviews on the Asics S4 wiki page.
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The Asics S4 lasts about 300 km, based on hand-researched wear data for this model. Your own mileage shifts with body weight, running surface, and how you use the shoe.
Start checking for wear around 180 km (60% of its lifespan). By 240 km the foam and outsole are usually noticeably degraded, and most runners retire the shoe between there and 300 km.
Long Distance shoes in NORMA's database range from 300 to 900 km across 71 models. At 300 km, the Asics S4 sits in the lower half of that range.
Often, yes. A pair with under 60% wear (roughly 180 km) still has real training life left. NORMA lists second-rotation running shoes with transparent, verified mileage so you know exactly how much life you're buying.
