Made Of Stainless Steel. BevGuard™ Triple Insulation For Keeping Your Drink Hot And Cold. Screw-On BevLock™ Tritan Leakproof Lid Seals It Tight To Prevent Spills And A Magnetic Closure To Keep Lid Open While You Sip. Double-Threaded Design Allows For Left Or Right-Handed Use. Cup Holder Friendly. Non-Slip Base. No Condensation. No Metallic Taste. BPA Free. Meets FDA Requirements. Dishwasher Safe.