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The main idea behind the T-Free socks is to combine an already highly technical Sidas sock with a separate compartment for the big toe. The role of the big toe in running is significant in terms of balance, step direction, and the push-off phase. Among those involved in the design of the sock model is Jonathan Albon.
The knit varies in thickness at different points - areas that are not prone to intense wear have a more breathable knit than others. Compared to running socks designed for even surfaces, Sidas trail running socks have additional padding in the ankle, toe area, and heel.