Tommee Tippee Closer to Nature Easivent Fast Flow Teats has been designed in conjunction with breastfeeding experts. The revolutionary Closer to Nature Easivent teat mimics the natural flex, movement and softness of your breast to make switching between breast and bottle more accessible than ever before. The unique shape of the Tommee Tippee Closer To Nature Easivent Fast Flow Teats encourages your baby’s natural feeding action so that switching between breast and bottle becomes second nature. They feature a super-sensitive anti-colic valve made from soft, natural feel silicone with a unique, easy latch-on teat shape. Tommee Tippee Closer To Nature Easivent Fast Flow Teats are BPA free and designed for fast milk flow ideal for babies over six months.