The newest fall trend to take hold of sweater lovers everywhere is the roll-neck style. But what does that even refer to? In a day of turtleneck, roll-neck and mock-neck styles, it can be confusing to decipher between them. Well, we have all the details, including 13 trendy sweater finds that get you the look. Don't know much about roll-neck sweaters? Unlike a turtleneck that goes nearly all the way up and a mock-neck that's short but doesn't roll over - the roll-neck is somewhere in between. The neckline rolls over itself ever so slightly to create a casual yet interesting appearance.