Polo neck sweaters are characterized by a raised collar. Some polo neck sweaters also have two or three buttons directly below the neckline. Some men keep these buttons closed, while others open them to reveal an additional garment worn underneath, for example a T-shirt. Because of their sporty look, polo neck sweaters should not be worn in formal or professional settings. In warm spring and early fall temperatures, many men roll up the sleeves of a polo neck sweater to their elbows to create a cool, relaxed look.