Stainless Steel Travel Mug - Vacuum Insulated - Coffee Mug - Silicone Sleeve and Lid Lock features. SOLID CONSTRUCTION - The Easy Togo Travel Mug is fabricated with high quality 18/8 stainless steel on the inside and outside. HOT OR COLD - The vacuum insulation in the Easy Togo travel mug provides preserving hot or cold beverages for hours. LID LOCK - The unique lid lock feature provides better usability. The switch can be toggled to lock/unlock the lid opening mechanism. GREAT SMALL FEATURES - The Easy Togo Travel mug comes with great small features like Silicone Sleeve for easy handling, wide mouth opening for easy refilling of liquids, easy to clean lid etc. GREAT TRAVEL MUG - With a 12oz capacity the Easy Togo Travel Mug is a perfect size to carry your drink around with you. This travel mug also fits in your car cup holder !