Rectangle sunglasses are a type of eyewear that have lenses that are rectangular in shape. These sunglasses can come in a variety of styles and can be worn for both fashion and functional purposes. Some people may choose to wear rectangle sunglasses because they feel that the shape of the lenses helps to elongate their face or because they prefer the aesthetic of the rectangular lens shape. Others may wear rectangle sunglasses for the functional benefits that they provide, such as enhanced vision and protection from the sun's harmful rays. These types of shapes are both trendy for women's and men's sunglasses.