Took these on a 3 day mtb tour in Tasmania and they held up incredibly well. They were very comfortable and didn't slide down. I think the lense improves the clarity around trail details like rocks and trees really well. They occassionally got small drops of muddy water on them but after letting it dry most of them just fell off. Didnt need any cleaning after 3 days and still super clear. In low light conditions e.g. very overcast in dense forest, the tinting was ok but getting close to too dark for me. Normally I just ride with clear lenses in all conditions.