Lenses The Aethon sunglasses come with a quick and easy to use interchangeable lens system and include three sets of lenses. This allows you to find the best coverage for your current lighting environment to offer the best vision across any terrain. Integrated vents help to keep your vision clear by boosting air circulation which reduces fogging. Each lens is constructed from polycarbonate which enhances impact resistance and full UV protection. The lenses included, are: Aethon White, Black, Clarion Red Interchangeable Sunglasses: Clarion Red (14.5% light transmission), All Conditions Red (41.4% light transmission), and Clear (95.6% light transmission) Aethon Crystal Blue, Clarion Blue Interchangeable Sunglasses: Clarion Blue (14.7% light transmission), All Conditions Red (41.4% light transmission), and Clear (95.6% light transmission) Frame The lightweight and flexible frame is made from Grilamid TR90 with a large to extra-large fit. To stabilise the sports glasses the nose and ear pieces are adjustable and coated in a specialised hydrophilic rubber for extra grip.