The closer to nature nipple shields are made from super soft silicone making them like a second skin for sore and cracked nipples. These Tommee Tippee Closer To Nature nipple shields come in a pack of 2 with a sterilisable carry case for microwave sterilising and hygienic storage. The shields allow skin-to-skin contact with baby while breastfeeding because the silicone gently flexes and stretches with the movement of the nipple. The Closer To Nature nipple shields are BPA free for baby's safety.