no need for another mirror even the heavier spray will glide easily off the goggle without sticking to the frame or affecting your sight. whether worn over or under the helmet, the extra wide goggle strap with color-blocking always keeps the goggle in the right place. the mirrored lenses of these retro ski goggles not only look cool, but also offer complete protection from infra-red rays. thanks polavision - improved perception. protection against reflections and other harmful irritations. the polycarbonate lenses of the uvex polavision® series absorb diffuse light and thus reliably protect the eyes from strain. they elliminate harsh glare and distracting reflections and convert diffuse into pleasant light.