The Medela Nursing Sleep Bra features a light cotton fabric, and a tag free design so you can wear it while sleeping and keep breast pads in place to absorb leakagMade of 95% Cotton and 5% Spandex. - Medela Nursing Sleep bra has been tested and certified in accordance with the OEKO-TEX Standard 100 requirements, which ensures products are free from harmful substances. Luxurious combed cotton and tag-free design ensures comfort against sensitive skin. Keeps breast pads in place to absorb night-time leaks. Pull aside design for convenient nursing access. Racer-back design evenly distributes breast weight and keeps straps in place | Medela Nursing Sleep Bra Black Large