Pura Silicone Sports Straw Top is a free-flowing two-piece straw with a flip lid to eliminate spills and keep the tip clean. This all around top works equally well for 3 year olds, older kids, teenagers and even adults; in fact anyone seeking a 100% plastic-free, free flowing, leak-proof top for their stainless bottle. Convert your standard or insulated Pura Kiki bottle into the perfect bottle for school age kids! Crafted entirely from medical grade silicone Pura's Big Mouth® Sport Straw may very well be the only 100% plastic-free straw top on the market (except Pura's valved sippy toddler straw). Includes Pura measuring tape allowing you to cut your straw to fit ANY Pura bottle.