1. Leak-proof,Rust proof and Durable Quality:High-quality food grade 18/304 stainless steel on both inside and outside walls. This FDA approved will never rust or leave a bad metal taste in your mouth. BPA Free for heath-safety.2. Unique Vacuum Insulation Technology: The double-walled vacuum insulated exterior will keep your drink cold for up to 24 hours or hot up to 12 hours.3. Keeps Your Drink Hot &Cold:Great for cold water, Iced Coffee, hot drinks, hot coffee, hot chocolate,etc.4. No Leaks:The exterior will never sweat. Don't worry about getting water on your desk, rings on your table, or a mess in your bag!5. Perfect Size &Easy to carry: The capacity is large enough to fit your daily hydration needs. Fashion cola style,easy and comfortable hold in hand and drink. And it is fit most cupholders.Put your portable sports water bottle in your gym bag, backpack or briefcase as your daily companion. 6. Bonus a Cleaning Brush:Warming action gives you a free gift to make it easier for cleaning. Plastic handles of the right length make it easier for you to grip comfortably.