Warranty: If your glass bottle breaks within the first year of purchase, we will ship you a replacement for free and cover the shipping costMASON JAR STYLE: Our 20oz. Mason jar style glass tumbler with protective silicone sleeve and matching straw makes the perfect on the go tumbler! This Mason jar style tumbler is a healthy way to stay hydrated and will make the perfect addition to your home, office, and or as a gift for someone that is looking to go into the reusable route! Perfect for any occasion our glass tumblers are made to take with you and are designed to fit into your bag, cup holder, and your life!BOROSILICATE GLASS: Made from the same glass used for scientific test tubes our glass tumbler is made to withstand beverages of various temperatures. The BPA for Easy to grip silicone sleeve is removable yet anti-slip and provides some impact protection, but remember it is still glass and fragile! Our tumbler is DISHWASHER SAFE however, we recommend hand-washing and drying the sleeves.EASY CLEANING & SECURED PROTECTION: The metal ring and silicone top separate for easy cleaning and convenience, and can be used without the lid for a smooth wide mouth design delivers a comfortable drinking experience for adults and children alike for fun drinks and entertaining! The silicone that is secured between the unbreakable metal ring helps prevent minor leaks but it is NOT upside-down, bottom-of-the-bag leak-proof.2-WAY DRINKING OPTION: Each glass tumbler offers two ways of drinking, you have the options of using the straw that is provided or you can use the silicone top that goes between the metal ring for sipping on your favorite beverages! Made from a soft non-toxic silicone material that’s naturally devoid of BPA phthalates and other chemical contaminants. The protective sleeve and matching straw are both made from this material making it a healthy and smart choice for hydrating!