A square neckline works best when the fabric moves easily and sits right. Cotton tank tops with a square neck have the structure to hold the neckline in place without strangling you and the breathability to actually feel good when you wear them. The square shape frames the shoulders and collarbones in a way that feels intentional rather than accidental. These are the cotton square neck tank tops that prove a simple neckline detail can change how an entire outfit reads. Layer them under an open shirt. Wear them solo in summer. The neckline does the work for you.