The Epoch Folding Goggle is a flexible frame with an adjustable strap backed by vented foam. It's super comfortable fitting protective eyewear used by motorcyclists, skydivers and everyone in between. The photochromic lenses change from clear to smoke; as the light conditions change, your lenses change to block more sunlight. Fit for any size head and fits great under helmets.; 100% UVA/UVB protection Shatterproof polycarbonate lenses with anti-fog coating High-impact polycarbonate frames Adjustable strap Folds for easy storage Meets or exceeds ANSI Z87.1 safety standards Two-year limited manufacturer's warranty