The closer to nature teat mimics the natural flex, movement and softness of a mother's breast making the switch from breast to bottle even easier. The new teat is much more 'breast-like' in shape than a normal wide neck teat. This is to ensure that when your baby switches between the bottle and the breast, they can latch onto both in exactly the same way. The teat is made of a softer touch silicone that, when filled with liquid, is warm and supple just like breast feeding. The super-sensitive anti-colic valve on the side of the teat is designed so that there is optimum venting of the bottle - ensuring an uninterrupted and comfortable feed for your baby with less risk of colic.