Think of these frames as a bigger serving of the classic D2s. The D1 has been updated und upsized witha larger fit resulting in even wider peripheral views through its cylindrical lens.
The "transitions adaptive shield" automatically darkens and lightens in response to changing sun light and weather conditions. They are color optimized to help improve visual performance during outdoor sports and activities, enhance contrast, and increase depth perception.
The mission statement of the Dragon Alliance is to support the best athletes with the best products. Thankfully for the rest us, Dragon Optics make goggles, sunglasses and accessories which are polished to perfection.