Made Of Stainless Steel . BevGuard™ Insulation For Keeping Your Drink Cold For 24+ Hours And Hot For 6+ Hours . Screw On, BevLock™ Spill-Resistant Lid With MagFlip™ Technology To Keep Your Lid Open While You Sip. 100% Leakproof When Locked. Holds A Half Bottle Of Wine Or 375 mL Of Your Favorite Beverage. Easy On & Off OctaLock™ Threading System With 8 Different Drinking Positions. Non-Slip Base . No Condensation . No Metallic Taste . Meets FDA Requirements. BPA Free . Hand Wash Recommended.