The inner and outer walls are vacuum insulated creating the ultimate thermal barrier to preserve hot beverages for up to hours and cold & Hot. Perfect as a travel coffee mug. Our original intension is to keep everyone enthusiastic and courageous. No matter where your journey leads make sure you find different colorful scenes with our water bottle. Also focus on innovation, makes our products more competitive during every breakthrough, and grows strong step by step. This water bottle is designed for adventurous outdoor activities and is crafted perfectly for home use as well. Your heart is filled with hope not only traveling around world, but also staying at cozy home.