This tumbler features original dark fantasy artwork of a skull demon surrounded by flames, bats, and mystical symbols. Thanks to thermochromic technology, the design shifts and reveals as the temperature drops — add a cold drink and watch the eerie patterns come alive. Great for ice-cold sodas, iced coffee, energy drinks, or any chilled beverage. Crafted from food-grade aluminum, it's lightweight and durable — no fragile ceramic. It keeps drinks colder longer and holds up to everyday use. Choose your setup: • Cup only – sleek and simple for on-the-go sipping. • Full set with lid and straw – spill-resistant and ideal for travel or long sessions at home. Available in Skull Style and Devil Style color options. Key Features: • Thermochromic cold-reactive color-changing design • Food-grade aluminum construction for safety & durability • Original dark fantasy skull & demon artwork • Options: Cup only or complete set with lid + straw Frequently Asked Questions How does the color-changing effect work? Thermochromic technology reacts to cold temperatures — as you pour in a chilled drink, the demon/skull artwork shifts and reveals hidden details. What's the difference between cup only and the full set? Cup only gives you the tumbler alone for simple sipping. The full set adds a matching lid and straw for spill-resistant use during travel or long sessions. Is this dishwasher safe? Hand washing is recommended to preserve the thermochromic coating and color-changing effect over time.
