The trigger-action lid makes this thermo cup leakproof and easy for one-handed use. The lid is designed with a push button, which opens the mouthpiece on top. This unique feature makes The Stanley Trigger-Action Travel Mug perfect for sipping on-the-go. It's also designed to fit in most cup holders so it can ride along on your daily commute. The double-wall vacuum insulation keeps your favorite beverage hot, cold or iced for hours. Finally, the lid disassembles for deep cleaning. Every piece of this Stainless Steel travel mug is dishwasher safe.