The Vacuum Insulated Stainless Steel Bottle 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. Designed to take a hit, this double-walled bottle is made of heavy gauge 18/8 stainless steel, yet remains easy to carry with removable paracord lanyard. DOUBLE WALLED: Constructed of double-walled, vacuum insulated heavy gauge 18/8 stainless steel PARACORD LANYARD: Soft climbing rope inspired handle that's easy to remove when cleaning; Elastomer grip and less than a 360 degree rotation makes the bottle easy to open and close in a snap HOT & COLD: Vacuum insulated stainless steel ensures your drinks will stay cold or hot for hours; Up to 10 hours for hot and 30 hours for cold SEAMLESS FIT: A smooth polished thread-free mouthpiece that's not only a nice surprise, but stays clean even when you don't; Large 1-1/2-Inch opening to easily fit half-moon ice cubes made in most fridge ice makers