A Lansinoh breastfeeding nipple shield can help during the nursing process with latch on difficulties related to flat or inverted nipples, tongue or lip tie, and overactive let down. These breast shields for breastfeeding are made out of ultra thin, super soft flexible silicone that's BPS and BPA free. With these nipple guards breastfeeding isn't disrupted because the cut out design provides maximum skin to skin contact the entire time. Each set of nipple shields comes with a protective case for hygenic and convenient storage between uses. A nipple protector for breastfeeding should only be used under the advisement of a healthcare professional.