Used indoors for about an hour. Marked size: 38. Japanese size: 24.5, but fits me perfectly, and I usually wear 23.5-24cm. I tried them on and this size was perfect. I also researched how to buy based on the manufacturer's size, so please use this as a reference. 【ALTRA】TORIN 6 Color: Black Size: 38 Condition: New, Unused Retail price: 24,750 yen This high-spec model offers excellent shock absorption with maximum cushioning, a non-slip sole for rocky terrain, and durability for all terrains. ALTRA's unique Zero-Drop design and FootShape™ design reduce stress on the feet and support natural running, even on long mountain trails, gravel roads, and wet surfaces. This is the latest model in a series supported by many runners, from beginners to advanced. Perfect for everyday use, as well as hiking, trail running, and camping. Designed for stability and breathability. *The actual color may differ from the photos depending on the shooting environment and monitor settings.