Flip up sunglasses have been around for a long time. Flip up sunglasses are great for people who are going in and out sunlight regular throughout the day. Who wants to have to take on and off sunglasses if you are just running into a building and coming right out into the sunlight? These sunglasses would be ideal for someone who works as a delivery man. Flip up sunglasses provide great UV protection and can be worn by either gender.