Clip and Pump Hands-Free Nursing Bra Accessory in Sustainable Yarns, Black, Medium (Band Sizes 36-38). OKEO-TEX Standard 100 certified (12.HUS.14038 HOHENSTEIN HTTI).For moms and Mother Earth too, our innovative Clip and Pump Hands-Free Nursing Bra Accessory is made with an ultra soft and sustainable blend of organic cotton and TENCEL Modal. Its patented design clips into your nursing bra to transform it into a pumping bra in seconds, for effortless and discreet hands-free pumping. No more worrying about spilled milk It's better for you and the planet. It's comfort with a conscience.