Premium Double Wall Stainless Steel --- Crafted from high-quality stainless steel, this coffee cup is sturdy and shatterproof. Leak-Resistant & Smart Lid Design --- The travel mug features a BPA free screw-on lid with a silicone seal ring to effectively prevent leaks. The convenient flip-top lid of the coffee mug allows for easy one-handed drinking; simply open the sip hole. The thermal cup lid's inner square and outer circle design makes it easy to twist on and off for quick refilling and cleaning. Comfortable Non-Slip Grip & Base --- The matte, silicone body offers the thermal mug an elegant look and a comfortable grip. The rubber base enhances stability, preventing the mug from sliding or tipping over. With a 70mm bottom diameter, the coffee flask is designed to fit conveniently in most car cup holders, ideal for on-the-go. Long-Lasting Temperature Retention --- The double wall vacuum-insulated construction is engineered to keep your beverages hot or cold for hours, letting you enjoy your beverage at the perfect temperature anytime. Portable & Spill-Resistant Design --- Take your favorite beverage with confidence. This insulated mug is designed to be spill-resistant, making it a reliable companion for worry-free transport in your bag, backpack, or suitcase. Perfect for the office, school, travel, sport and parties. Double-wall vacuum insulation helps reduce heat or cold transfer, keeping your drinks at ideal temperatures for extended periods. The coffee cup exterior stays comfortable to touch when filled with hot liquids.