Under Armour Men's Fat tire GTX Socks Synthetic Inspired by Fat Bikes. These bikes have oversized tires which allows them to run at a lower PSI and Bounce over the Terrain. They can essentially ride through anything and go anywhere HeatGear lined synthetic strap offers custom fit and comfort We took our bouncy Charged Cushioning and bottom loaded a softer high rebound foam, This allows the shoe to be responsive yet morph/adapt to the terrain We partnered with Michelin for the optimum outdoor compound and traction pattern, This traction has excellent cross-slope grip and optimum all terrain traction.