The KOO collection is designed specifically to work seamlessly with KASK cycling helmets. KOO open glasses also feature easily-removable, interchangeable lenses for year-round optimum vision when cycling. The design also includes an ˜Airflow Active System which means the lenses can be tilted at three different angles to adjust the position of the glasses on your face. Flexible temples should also improve the fitting without interfering with comfort. The sunglasses are constructed of polycarbonate with each component 100% made in Italy. Attention to detail has been paramount with lenses manufactured by the renowned lens maker Zeiss.