As you head out for the day, you want to keep a good pair of lightweight sunglasses right within reach. Whether you plan on keeping them in the glove compartment of your car, in a secure case in your bag, or hanging conveniently at the neckline of your shirt, you want your sunglasses there for you when you need them. As you are looking for the best lightweight sunglasses out there, there are certain details you want to keep in mind. There is much more to high-quality sunglasses than looks alone. When you shop for your next pair of sunglasses, here are some things you want to keep an eye out for.