Capacity: 400ml-500ml Healthy Material - The Vacuum double wall was made of high quality grade 316 stainless steel that completely taste-free, rust-proof, leak-proof, The lid was made of food-grade silicone, BPA free, guaranteed high durability. Easy to Drink: coffee mug includes an eco-friendly flap opening that makes drinking one-handed a breeze. The outer layer of the cup is wear-resistant and anti-drop, and has a comfortable grip. Easy to drink with one hand. Keep Hot and Cold for Hours: keeps hot / frozen drinks up to 6 hours or more. （Please note that putting hot water above 60 degrees may cause the air pressure in the cup to be too high, and the hot air or hot water will be sprayed out instantly when the lid is opened. Please use it safely） Leakproof Design - The coffee mug lid comes with an airtight silicone seal that prevents the drinks from spilling. Air Vent on the lid allows beverages to flow out smoothly, without gushing or overflowing.The rubber design at the bottom prevents the cup from slipping or tipping. 12 oz Stainless Steel Vacuum Insulated Tumbler - Coffee Travel Mug Spill Proof with Lid - Thermos Cup for Keep Hot/Ice Coffee,Tea and Beer