I haven't used it much. It has a frameless design that simply hooks over the ears, so it won't mess up your hairstyle. * It won't get in the way when wearing a hat or helmet. * It can also be used over in-ear headphones, and it's easy to put on and take off. * It's compact enough to fit in a pocket or bag, making it useful for a wide range of situations, such as leisure, sports, and commuting to school or work. How to Use (1) Gently bend both sides outwards. (2) Place the wider brim on the inside behind your ear, slide it forward while putting the back of your ear into the brim, and cover your entire ear. (3) Push the top and bottom edges inwards, return the bend, and cover your entire ear.