Featuring a half frame the dhb photochromatic sunglasses offers protection from sunlight wind and debris and has a lens filter category 3 which is heavily tinted for use in bright sunlight technical lenses the photochromatic lenses go darker when exposed to ultraviolet light with a uv absorbancy to give you 100 uva and uvb protection they are shatter proof and scratch resistant to make them highly impact resistant against debris which may flick up from the road whilst out riding a mirror f