Made Of Stainless Steel With Copper Plated Inner. Double Wall Construction For Insulation Of Hot Or Cold Liquids. Vacuum Insulated . Keeps Drinks Cold Up To 12+ Hours And Hot Up To 3+ Hours. Snap On, Spill-Resistant Thumb-Slide Lid With Removable Slider For Easy Cleaning. Perfect For Beach Lovers. Party Cups Can Be Stacked Together. Non-Slip, Scratch Free Silicone Base. Condensation Free . Cup Holder Friendly. Swig Life™ Is A Certified SWaM Owned Business. Women Owned. Meets FDA Requirements. BPA Free.