The Klean Kanteen Insulated TKWide 12 oz Bottle with Twist Cap is designed to keep your beverage cool. With a leakproof twist cap and a stainless steel straw, it's a must-have for thirsty explorers on the move. It keeps ice solid for up to 33 hours. Toss your bottle into a bag with every confidence that you won't be faced with leaks or spills. Each bottle is made of 18/8 stainless steel, offering durability. The smooth, rounded lip is easy to clean and feels great against the mouth.