Awesome sunglasses for active-wear. They fit snug, but they're not uncomfortable. They really stay in place and I don't have to constantly shift them like I have to with other sunglasses. The lenses are extremely easy to swap out even on the go. When the trail turns to snow, I can swap out to a darker lens in just a few seconds right on the trail. The vented lenses don't fog up but still block the wind. If you're looking for one pair of sunglasses that does it all, this is it.