Instead of the standard matt finish, Thunder + delivers an incredible soft touch finish, which not only adds to your all-day comfort but reduces slippage in sweaty situations. They've beefed up the temple design to add strength and increase the frames aerodynamic ability. The integrated hinge is secured with 316 marine grade stainless steel screws. To top it all off they've added some well-placed girth, so the overall fit is roomier but not massive. Halide Lens Specifications Halide is the culmination of almost 2 years of intense design and development and is specifically engineered for extreme conditions; it can withstand Australia’s brightest, sunniest, high glare conditions and still offer perfect optical clarity, insane depth perception, and high scratch resistance. The Halide lens has been specifically developed for people who are sensitive to extreme glare. The unique high contrast copper tint of the Halide lens offers better clarity and depth perception to the human eye than any other colour, and delivers it without distortion. Halide makes objects sharper, gives clearer vision over distances, shows greater depth perception in water and eliminates eye fatigue and headaches. The Halide lens is also dark enough to hide your eyes.