The breast tape is made of 95% cotton, 5% spandex and adhesive. Hypoallergenic, soft and comfortable. They are ergonomically designed to make you feel like wearing nothing. The breast lift tape have a strong adhesion and do not fall off easily. They are waterproof, even though you are wearing it under the water or you sweat a lot, they will keep attached to the body like the second skin. Very thin so it isn't easy to detect. Perfect solutions for tops, blouse shirts, strapless, backless, deep-v, wedding dress. Wide application: perfect for backless/strapless dresses, t-shirts, halter tops, wedding gowns, sports bras, swimsuits.