Nice goggles, got it today so i haven't played with it much, but it seems that the lenses are flexible, yet durable. The frame and vents around the goggles are very strong because when I was trying to switch out the black lens to clear lens I was bending the thing everywhere, but still everything is intact and working properly
Switching Out Lens (since there is no manual)
-Remove the top two OR bottom two vents on the goggles so that you can more easily remove the lens
-facing the front of the goggles, push the rubber outline covering the lens back and push the lens out
-put new lens in, start from the left OR right sides.
*Note* the frame is durable and flexible so you can pull the frame to take out and put in the lens and vents on the goggles. Care when taking out the vents, there is a rubber thing if you look inside the goggles, in between the vents. You will see it when you get it, its a lot easier than it sounds.
3 durable lens
Flexible yet stretchy strap
Its a little wide from the sides of the eyes, but its not that big of a deal.
Takes getting used to and finger pains to remove and put back vents and lens