This shatter proof and leak proof Sttoke Reusable Coffee Cup also boasts award winning ergonomic design. Its double walled insulation keeps beverages hot for six hours and cold for eight hours, while it stays lightweight and comfortable to hold. For stress free travelling, its screw in lid is 100% leak proof, while the German engineered Greblon ceramic lining won't break or shatter if dropped. Made to fit in all cup holders, it also features a smart inbuilt coaster for next level convenience.