The 350 Ml Stanley Aerolight™ Double-Walled Transit Tumbler With Vacuum Insulation Is Designed To Be Lightweight Without Compromising The Desired Liquid Temperature, Keeping Drink Hot For 6 Hours Or Cold For 8 Hours. The Tumbler Is Leakproof With A Locking Screw-Top Lid. This Means You Do Not Have To Worry About Spills As You Throw Your Bottle In Your Bag & Jump On Your Commuter Train Or Begin Your Exercise. In Addition, The Aerolight™ Tumbler Is Dishwasher Safe & Bpa Free, & Is Designed For Easy Cleaning. Fits Most Car Cup Holders. The Commuter-Friendly Transit Tumblers Are 33% Lighter Than Stanley’S Standard Stainless Steel Metal Drinkware. Minimum Quantities Apply.