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In trail running, depending on the slope, road surface, and pace, a slight slippage in the soles of your shoes can make downhill running easier. People who are used to this style of running say that socks and insoles with a moderate amount of slippage also help to balance the grip of the shoes and speed. As a brand that specializes in socks, we wanted to respond to this voice. Despite featuring the Spider Arch System, five-finger construction, and Lycra, we have deliberately chosen not to use anti-slip materials. This is a product unique to YAMAtune that pursues a running style.
| - | JP | UK | US | EU |
| KidsS (4S) | 16-18 | 9-11 | 10-12 | 26-29 |
| KidsS (3S) | 19-21 | 12-1.5 | 13-2.5 | 30-34 |
| SS | 21-23 | 2-4 | 3.5-5.5 | 34.5-36.5 |
| S | 23-25 | 4-6 | 5.5-7.5 | 36.5-38.5 |
| M | 25-27 | 6.5-8.5 | 7-9 | 40-42 |
| L | 27-29 | 8.5-10.5 | 9-11 | 42-44 |
