These are really sweet goggles. On-piste, where you generally have a lot of air moving through the goggle, they do a great job of staying fog free. Off-piste/backcountry, where you have a lot of stop and go action, they don't work quite as well as the frame design keeps the lenses fairly close to the face, leading to some condensation on the inside when you sweat hard. That said, the lenses are awesome (Zeal is well known for having some of the best lenses in all their products), the photochromatic stuff works very well. Bottomline: Unless you do ALL your skiing/riding in the backcountry, I would highly recommend these goggles. Otherwise, stick to something that gives you a little more room/frame space between the face and lens.