18/8 food grade stainless steel doesn"t retain or impart flavors - liquids always taste fresh and clean * Free of BPA, phthalates and other toxins for a safe, plastic-free bottle * Slim design fits most bottle/cup holders and rounded corners make it easy to clean * Silicone Sport Cap 3.0 provides smooth flow with a soft texture that"s easy on little gums and teeth * Can be used with the Klean Kanteen Sippy Spout or Loop Cap for additional options