These hand made frames are sculptured from pure G-50 Gunmetal and combine precise symmetry for added balance and comfort. Each style offers an adjustable, non-slip neoprene nosebridge, for select frame positioning. The spring loaded, soft rubber temple tips help keep the system stable while you enjoy clear, polarized optics without incurring any visual compromise. Each 8 base frame cups they eye orbits to reduce annoying reflections caused by back light and give the glasses a sleek sharp appeal. Wiley X's frameless models utilize flex frame technology. These thin, lightweight frames provide just the right amount of resistance, making them the most comfortable sunglasses you'll ever wear. Flex frames eliminate the need for spring hinges and fit a wide range of facial features.