I bent 'em. I stretched 'em. I blew on 'em. Believe me, I tried to thrash these goggles, but to no avail. The shatterproof polycarbonate lens still looked brand-new. And no matter how hard I huffed and puffed, purposely directing my breath toward the lens as I slogged uphill on a cold day, the Zeals refused to fog. Plus they were smooth lookin' and super comfy¿even with my helmet. Bottom line: They rock.