Zoku bottles are designed to look great, yet stand up to the rough and tumble real world life of a Colby water bottle! Double-wall bottle is well made of heavy gauge 18/8 stainless steel that is designed to take a hit. Bottle is easy to carry with a removable paracord lanyard. Vacuum insulated stainless steel makes sure cold beverages stay that way for up to 40 hours, and hot beverages do not lose steam, maintaining heat for up to 12 hours. That should keep you going whether you are off to class and then studying in Miller, or headed off to the mountains or lakes for an adventure outdoors. Colby is printed in block lettering near the bottom of the bottle. Similar style ZOKU imprint on the opposite side. Hand wash, do not use dishwasher. BPA and Phthalate free.