Zenana Women's Sleeveless Tube Top with Shelf Bra 5% spandex 95% Cotton 5% Spandex, Shelf bra SHELF BRA IS THE EXTRA MATERIAL WITH ELASTICIZED BAND UNDER BUST-NO PADDING Junior Sizing: Small-13" from underarm to underarm unstretched Medium-14" from underarm to underarm unstretched Large 15" from underarm to underarm unstretched