Stainless Steel Outer And Inner With Silicone Base Sleeve. Powder Coated Finish On Stainless Steel Material. BevGuard™ Insulation For Keeping Your Drinks Cold For Hours. Compatible With Cold Beverages And Iced Carbonated Beverages. Screw On, SlideSeal™ Spill-Resistant Lid With SoftSip™ Soft-Tip And ColdKey™ Stainless Steel Straw. Thumb-Slide Mechanism For Popping Up Or Pushing Down Straw, Perfect For Sanitation. Durable And Removable Silicone Base Sleeve Protects Against Drops, Dents And Dings. 100% Leakproof When Locked. Easy Carry Handle. Non-Slip Base. Cup Holder Friendly. Meets FDA Requirements. BPA Free. Hand Wash Recommended.