Stainless Steel Outer And Inner With Silicone Base Sleeve. Powder Coated Finish On Stainless Steel Material. BevGuard™ Insulation For Keeping Your Drink Cold For Hours. Screw On Ü-Turn™ Spill-Resistant Lid With ColdKey™ Stainless Steel Straw And Easy Carry Handle. 100% Leakproof When Locked . Simply Turn The Mode Indicator To The Appropriate Position For Stress-Free Sipping Mode To Open Straw And Sip, Leakproof Mode To Close Straw, Or Cleaning Mode To Clean. Features A Rubber Grip That Makes Opening Easy Without Having To Touch The Straw . Durable And Removable Silicone Base Sleeve Protects Against Drops, Dents And Dings  . Non-Slip Base. Cup Holder Friendly . No Condensation . No Metallic Taste . Meets FDA Requirements. BPA Free. Hand Wash Recommended.