Salomon Men's S-Lab Sense 4 Ultra Trail Running Sneakers Mesh Breathable Mesh Upper - Allows air to permeate the shoe. Seamless Sensifit - A seamless layer that guarantees a secure and precise fit whilst providing a seamless feel. Endofit Upper - An internal fit sleeve designed to hug the foot in exactly the right places and improve feedback. Dynamic Traction - Allows dynamic grip in unfavourable weather conditions. 6mm Heel-to-Toe Offset - Encourages a more natural running motion with a footstrike that occurs nearer to the front of the foot.