Round neck and V-neck are the most classic collar types in T-shirts. Generally speaking, they can meet the needs of most men. V-neck T-shirts can naturally lengthen the neck lines, have the effect of lengthening the height and slimming, and can perfectly set off the lines of men's breasts, inadvertently revealing sexy masculinity. In addition, V-neck can lengthen round and wide faces, but men with slender faces should avoid choosing deep V-neck, which often makes their faces look longer.