The X-SOCKS TRAILRUN TERRASKIN EXPERT CREW have been specifically designed to offer you maximum stability and efficiency on any trail. The integrated Trail Suppronation Bandage surrounds your joint precisely, keeps your muscles engaged, and promotes a natural forward rolling motion. The result: less fatigue, greater power transfer, and a more efficient running stride. The GripFix yarn with silicone strips ensures maximum adhesion between sock and shoe. This way, you maintain control even on slippery surfaces and prevent blister formation. The Achilles tendon protection surrounds your tendon with strategically placed shock-absorbing pads. These create a protective recess that prevents pressure and blister formation, allowing you a frictionless run. Thanks to the Air-Conditioning channel that runs from the sole to the cuff, you benefit from optimal ventilation for your feet. The natural pumping motion of your arch is utilized to draw in fresh air and expel hot air with each step.