SAFE AND DURABLE - The IDEUS coffee mug with lid ​is constructed from SUS 304 18/8 stainless steel, premium silicone, and Tritan-copolyester. We really believe that using top-notch materials is the key to giving you an awesome drinking experience. VACUUM INSULATION - The advanced double-walled insulation technology demonstrates excellent retention performance. These thermal mugs are capable of maintaining cold beverages for up to 12 hours and hot beverages for up to 6 hours, thereby ensuring that drinks can be enjoyed at the preferred temperature. EASY TO CLEAN - Utilizing cutting-edge surface protection technology, coffee travel mug ​exhibit a smooth, solid design that is aesthetically pleasing. Typically, a simple rinse with tap water suffices for cleaning. SPILL-PROOF LID - Designed by a professional team of designers, our slider lids facilitate sipping with just a gentle touch. They effectively prevent splashing and spilling; however, it is advisable to avoid turning them upside down as they are not entirely leak-proof. IDEAL GIFT - Perfect for enjoying beverages and an excellent choice for personalized party favors, outdoor camping trips, corporate giveaways or office settings. Whether it's Christmas, Valentine’s Day, or someone’s birthday, anyone who gets this coffee mug with handle ​will definitely feel your warmth and thoughtfulness! IDEUS 16oz Insulated Coffee Cup – Modern Elegance in Your Hand! Features a smooth slide-open lid for one-handed convenience (Note: Not leak-proof, recommended for upright use). An ergonomic curved handle molds naturally to your palm, paired with a soft-touch finish for fatigue-free grip even during long work sessions. The lustrous lacquer surface embedded with micro-glitter shimmers like stardust under light, while double-wall insulation locks temperature for 6 hours—ideal for hectic mornings or leisurely iced coffee breaks. With 16oz ideal capacity, whether carrying robust espresso or refreshing cold brew. Where functional design meets celestial charm.