Designed in conjunction with breastfeeding experts, the revolutionary new tommee tippee closer to nature easi-vent teat mimics the natural flex, movement and softness of a mums breast, to make switching between breast and bottle easier than ever before. The unique shape of the closer to nature easi-vent teat encourages your babys natural feeding action so that switching between breast and bottle becomes second nature. Features natural feel teat for just like mum feedings easy latch teat for smooth transition between breast and bottle optimum venting valve for less air intake and less discomfort for baby always bpa free for your ultimate reassurance teats are available in slow, medium, fast and vari-flow all teats are sold in a 2 count pack teats compatible with closer to nature baby bottle only. These teats are not compatible with advanced comfort or ultra bottles.