SAFE AND DURABLE - The VOLCAROCK coffee mug is crafted from SUS304 18/8 stainless steel, premium silicone, and Tritan-copolyester. We firmly believe that only high-quality materials can guarantee an exceptional drinking experience for our users. VACUUM INSULATION - Advanced double-walled insulation tech shows excellent retention performace. These mugs can keep cold up to 12 hours and keep hot up to 6 hours. It will make sure you drink it at your favorite temperature. EASY TO CLEAN - Adopting the latest surface protection technology, these mugs feature a smooth, solid, and aesthetically pleasing design. Generally, a simple rinse with tap water suffices for cleaning; they are also dishwasher safe. SPILL-PROOF LID - Designed by a professional team of designers, our slider lids allow you to start sipping with just a gentle touch. They effectively prevent splashing and spilling; however, please refrain from turning them upside down as they are not entirely leak-proof. We Make The Fine & You Pick The Right 💠💠Large capacity 16 oz 💠💠 Double Wall Vacuum Insulation, Keep Cold 6 Hours & Warm 5 Hours 💠💠 Dust-proof and Spill-proof Press Fit Slider Lid 💠💠 Sweat-free Powder Coating 💠💠 Wide & Tough PP handle, No Cold Steel Feel 💠💠 Fashion & Ergonormic Design for Easy Carry SPECIFICATION Material: 18/8 Kitchen Grade Stainless Steel Lid Material: Tritan Slider Cap: PP Gasket: Silicon Handle Material: PP Tips: 1. Wash Before Use 2. Lid is spill-proof but not leakage-proof 💠💠GUARANTEE: If you are not 100% satisfied with our products, please feel free to contact our customer service, we will get back to you within 24 hours.