Think of these frames as a bigger serving of the classic D2s. The D1 goggles have been updated and upsized with a larger fit resulting in even wider peripheral views through its cylindrical lens. The combinations of high-performance dual-layer face foam with microfleece lining plus a Super Anti-Fog coating means comfort and clarity no matter what conditions the mountains throw at you. The D1 OTG goggles feature a re-engineered inner frame allowing it to be Over-The-Glass compatible.