The formation of fog inside the lens of any cycling, MTB (Mountain Bike) or running sunglasses is a real and widespread problem for any athlete who practices any of the mentioned disciplines. This mishap usually occurs when humid air rises up the face and condenses on the eyewear, as there is a temperature difference between the two sides of the product in question. This inconvenience is also very annoying because, depending on the degree of fogging of the lenses, your visibility can be obstructed to the point of having to stop your activity to avoid a possible fall. Even though this is such a common situation, it is difficult to find glasses that do not fog up effectively and safely. read more