Pura Silicone Sports Tops are 100% plastic-free, free flowing and leak-proof. They easily convert your standard or insulated Kiki bottle into the perfect bottle for school age kids. Crafted from safe, anti-bacterial medical grade silicone, they include an attached lid to keep things nice and clean and a vented sip guard which eliminates spills but still allows free flow of liquids. They operate with all Pura Kiki and Pura Sport bottles.
eBay