To our knowledge the big mouth® sport top is the first and only 100% plastic-free sport top on the global market. You can rest assured that you are getting the safest top for your child or anybody in the family. Convert your standard or insulated kiki bottle into the perfect bottle for school age kids.The vented sip guard eliminates spills but allows free flow of liquids. Additional information: ~ Age range: 18 months to adult. ~ Includes an attached lid to keep the drinking surface clean ~ Vented sip guard eliminates spills but still allows free flow of liquids ~ Crafted from safe, anti-bacterial medical grade silicone ~ The only 100% plastic-free sport and activity top on the global market ~ BPA-free & EA-free - will not leach toxins like plastic straws or lids ~ Operates with all Pura Kiki and Pura Sport bottles ~ Big Mouth® Sport Top is not designed for hot liquids ~ Meets all FDA, CPSIA, EN14350, & German LFGB regulations and/or guidelines