Very easy to exchange lenses however the goggles were too large for my wife when using a ski helmet. The goggles forced the helmet to be pushed up high on her forehead. The same thing occurred with my adult daughters helmets.
These are amazing in the wind. I have allergies and these were the last product I was going to try. Glad I did. They are comfortable and keep the wind from irritating my eyes. Great purchase for riding motorcycles.