Stainless Steel Outer And PureSip Ceramic Inner Liner With Silicone Base Sleeve. Powder Coated Finish On Stainless Steel Material. Matching Interior Color Ceramic Inner. BevGuard™ Insulation To Keep Beverage Ice-Cold And Carbonated For 24+ Hours And Hot For 4+ Hours. Screw On, BevLock™ Spill-Resistant Lid With MagFlip™ Technology To Keep Your Lid Open While You Sip. Easy On & Off OctaLock™ Threading System With 8 Different Drinking Positions. 100% Leakproof When Locked . Durable And Removable Silicone Base Sleeve Protects Against Drops, Dents And Dings. Non-Slip Base. Cup Holder Friendly. Meets FDA Requirements. BPA Free. Hand Wash Recommended.