HIGH QUALITY FRAME:Aluminium alloy makes these frames ultra light weight yet strong and durable,while the temples are constructed of an aluminum/magnesium alloy, allowing for maximum comfort and flexibility.The Sunglasses weigh only 23g! You can hardly feel them on your face,but they are unbreakable.It is perfect for outdoor activities such as cycling,driving,riding a motorcycle,running,fishing,racing,hiking,skiing,and climbing.The stylish design is suitable as a high fashion accessory.