Serene Calibre by Happy Earth brings premium insulation to your daily commute. This 400ml travel mug features double-wall, high-grade stainless steel construction that keeps hot beverages hot and cold drinks cold for hours. The sleek design fits comfortably in cup holders and bag pockets, making it ideal for work, travel, or weekend adventures. Durable, leak-resistant, and built to last, it's the perfect companion for those who refuse to compromise on quality or style.