An unimpeded field of vision and adaptability in changing light conditions make these a perfect accessory to have on every ridethe one piece photochromic lense will react to light levels and rapidly alter to suit the conditions within 7 seconds the lense will become lighter of darker to suit the light levels whilst still offering you full uv protection plus the frameless design means that your field of vision is not hindered at all a vented nose piece and rubber touch temple tips will gri