2021 Duotone Entity Ergo
The skeleton of a foot consists of 28 bones. The foot bones can be divided into following groups: tarsal bones, metatarsal bones and phalanxes. 20 muscles and over 114 tendons and ligaments ensure the required flexibility and stability of the bones to each other. A fine nerve and blood vessel network supplies the surface and deeper muscles above and below the foot.
Long story short, this is why you need the new ergonomic NTT and the choice of four different sizes to find exactly the NTT which fits to your feet.