About this item 20 oz Tumbler With Straw and lid: Made of Premium 304 18/8 stainless steel which is anti-rust and lead free, more durable and easy wash than plastic tumbler. Excellent Temperature Retention & Insulated: Double Wall Vacuum Insulation Design prevents heat transfer to outer wall and to keep drinks hot for over 3 hours & cold for around 9 hours. It will complete meet your Daily needs and making your life more comfortable. Unique Powder Coated Finish: Using a unique coat of color that won't fade or crack through extended field use and provide additional texture and durability. Sweat proof, easier to grip. Eco-friendly & Splash proof: The BPA-Free lid with a sliding lock to access your beverage and provide maximum splash-proof capability. Slica gel O-ring keep warm and reduce the spill. The wide-mouth drinking hole on the top is easy to use with straws. Lifetime Warranty : We want our customers to be 100% satisfied, If you have any questions, please contact our customer service and we will reply ASAP. We are happy to provide 100% money back if product has any defect.