The Glass Tumbler With Lid And Straw Is Crafted From High Borosilicate Glass, Capable Of Withstanding Temperatures As Low As 27°F. However, Avoid Sudden Temperature Changes To Prevent Breaking. The Straw Is Also Made From High-Quality, Lead-Free Borosilicate Glass To Ensure Health Safety. This Dual-Purpose Design Allows You To Either Sip Your Drink Using The Straw Or Drink Directly From The Cup By Opening The Small Lid. The Lid Is Sealed With A Rubber Ring, Effectively Preventing Leaks. Lightweight And Portable, This Tumbler Is Ergonomically Designed For Easy Handling, Making It Perfect For Outdoor Use. The Anti-Scalding And Anti-Cold Leather Case Adds An Aesthetic Touch While Making It Travel-Friendly. This Versatile Glass Tumbler Is Ideal For Holding A Variety Of Beverages Such As Water, Juice, Iced Tea, Cold Brew Coffee, And Even Beer. Please Note That This Product Is Glass And Can Break During Shipping. If You Find It Damaged Or Unsatisfactory Upon Receipt, Please Contact Us For Assistance.