The Signature Sunhaters by "The Back 40" were designed from our "Morrison" Series. TB40 added a new matte black color and a Polycarbonate lens to give it 100% UVA and UVB resistance that will protect your eyes from the harmful rays of the sun. Every Morrison frame has spring hinges that will bend up to an extra 30 degrees to provide you with the best possible fit and comfort for your head. The nose pads are adjustable so you can fit the glasses to your liking. All our glasses are made from lightweight durable materials that will make your eyes and face happy.