So, make sure that your goggles fit over your helmet. Your goggles should also provide you with good peripheral vision. You need to see to the sides of you, as well as in front of you, while you are riding. The goggle's frame should be flexible. A Frame has air vents on the frame and lens of the goggle.
Foggy lenses are always a pain.
So, your goggles should have some anti-fog features. Air vents are one way to prevent fogging. Air vents can be located on the lens or on the goggle s frame. Also, double pane lenses help prevent fogging. Some goggles even have a small fan to help move air inside the goggle.