I bought these goggles for the interchangeable lens feature and the two lenses that came with the purchase. While changing the lens is fast and easy, I'm very disappointed in the lens light transmission characteristics; I was basically unable to tell which lens was supposed to be the low light/low contrast lens vs. the brighter light/higher contrast lens. I swapped lenses several times towards the end of the day, and when the light was flat (cloudy/snowy conditions) and essentially could tell no-difference in being able to see the contours of the snow surface. Perhaps I could try different lenses, other than those shipped with the goggles and achieve the difference I am seeking .... but based on others' comments, it's difficult to find lens options for these goggles. On the positive side, I had no problem whatsoever with fogging - skied with temperatures in the low teens to the mid 40s - snow, sunshine, wind, etc. - never any fog.