Double-Wall Insulated Tumbler - SUS316 Liner

The MUVNA Double-Wall Insulated Tumbler is engineered from the inside out SUS316 medical-grade stainless steel inner liner, SUS304 food-grade outer shell, 0.5mm thick walls, and a seamless silicone seal that locks temperature and prevents leaks. Whether you're brewing coffee at your desk or carrying it on the trail, this tumbler keeps your drink exactly where you want it.

• SUS316 Medical-Grade Inner Liner: The highest grade of food-safe stainless steel antioxidant, corrosion-resistant, and easy to clean. No metallic taste, no contamination, no compromise.
  
  
• SUS304 Food-Grade Outer Shell: 0.5mm thick super-hardness steel with a matte frosted finish. Durable, impact-resistant, and refined in hand.
  
  
• Double-Layer Insulation | 12–16H Performance: Double-wall vacuum structure locks temperature with precision. Fills with 95°C hot drink still 73°C after 12 hours. Loads ice at -4°C still -2°C after 8 hours. Heat retention: 12–14H. Cold retention: 12–16H.
  
  
• Seamless Silicone Seal | Leak-Proof: Surround silicone gasket with threaded lid design tight fit, efficient leak prevention, and no drips during carry or travel.
  
  
• Ergonomic Frosted Body: Matte finish feels delicate and secure in hand. Comfortable grip conforms to daily use habits functional style, engineered for real life.
  
  
• Lanyard with Alloy Spring Buckle: Included carrying rope rated to 5kg load capacity. Spring buckle alloy material with screw-lock position stronger, firmer, and more secure than standard clips.
  
  
• Professional Safety Certification: Tested by professional organizations to ensure all indices comply with food-use standards. Safe, reliable, and built for daily use.