i think Native must have found a new manufacturer for their replacement lenses since the Dash XP came out. the replacements are only very slightly larger than the originals. they fit in the frames, but they bow out so there's a gap along the top between lens and frame. this means there's light streaming onto the inside surface of the lens, creating glare and obscuring vision.obscuring vision is pretty much the opposite of what shades are supposed to do. considering a single set of replacement lenses costs about half the price of the original set of frame and lenses, there's not much point in buying these.