The greatest advantage of seamless bras is that they are less likely to be visible under clothing, especially t-shirts, knits and other clingy fabrics. With modern advances in fabrics and manufacturing, seamless bras don't have to be drab and utilitarian. They range in style from plunging neckline to front-close to contoured to no padding at all. Seamless bras can be embellished with lace or other trim, although that may tend to make them more visible under clothing.
Many seamless bra are designed with contour cups, which are shaped with some amount of foam and molded. Some styles may have just light foam to provide modesty or may have graduated foam to provide additional shape and cleavage. A seamless contour bra will create a smooth, shapely silhouette and is an ideal wardrobe option for women of all sizes.