This tee allows you to breastfeed discreetly. Just lift up on the finished opening at the rib cage and pull down on the underlayer fabric. * When you"re not nursing, this simple tee"s unique layers lie so smooth that the slit opening is quite disguised. * Cotton95%,Polyurethane5% * Size Information(cm):S(Length58,Bust82-96,Sleeve15,Cuff12.5,Hem41,Belly82-105), M(60,86-100,16,13,43,86-106), L(62,90-104,17,13.5,45,90-110) * A Note About Sizes: For a better fit, when you ordering SweetMommy"s wear, we recommend that you select one size larger than usual.