The Tommee Tippee Closer to Natural ® Nipples Shields are intuitively designed for more comfortable and more discreet breast care. These nipple shield are made from a thin soft silicone that acts like a second skin for sore and cracked nipples. While the high grade silicone flexes and stretches with the movement of the nipple, it's unique shape allows for baby to latch on for easier and more comfortable feeding. This same unique design with c-air slits in the shield allow for air to circulate and increases the skin to skin contact with baby while breastfeeding. This unique design provides baby with a more natural feel and smell of mom's breast. The Closer to Natural ® Nipples Shields fits all nipple sizes and come in a case that may be sterilized for hygiene. The case also doubles as a handy carry case while mom is on the go.