Double-Wall Insulation Coffee Cup: This Borosilicate glass tumbler features double-wall construction to keep your beverages hot or cold for extended periods Leakproof Sip Lid Included: Conveniently enjoy your drinks on-the-go with the included sip lid with BPA free silicone seal, designed glass cups for easy sipping without spills or leaks Hand Blown Borosilicate Glass Glass Coffee Cups: High temperature heat resistant glass capable of withstanding impacts and thermal shock. Microwave and freezer safe. Hand-wash only Easy Grip: Silicone sleeve for comfortable non-slip gripping and carrying of glass cup, making it a prefect coffee cup with lid Versatile Size: With a 10 oz (296 ml) capacity, this tumbler is perfect for hot or cold beverages, from coffee to smoothies Upgrade your morning routine with this double wall glass tumbler with sip lid. Crafted from durable and heat-resistant Borosilicate glass, this 10 oz (296 ml) mug keeps your beverages hot or cold for longer, thanks to its insulating double wall design. All glass for natural taste - no metal aftertaste or plastics that can leech or are harmful to the environment. The convenient sip lid allows you to enjoy your coffee, tea, or smoothie on the go without spills or leaks.