Zojirushi's high quality vacuum insulation provides superior heat retention so your beverage stays hot or cold for hours. The one-touch button allows for easy pour operation. The lid conveniently turns into a cup and the carry strap is adjustable and removable. Extra wide opening (2" wide) and nonstick coated interior makes the bottle easy to clean . All parts that come into contact with food or beverage are made of BPA-free plastic and 18/8 stainless steel.