Bamboo on the outside, stainless steel inside: It looks great and has a distinctly elegant look that makes it different than everyone else's coffee cup, it is also incredibly comfortable to hold. Food grade - stainless steel inside, you can be assured to use it safely.
Rubber Seal Ring and Foam Pad: As you can see in the picture, it has a rubber seal ring that makes your coffee or tea - hot for a longer time and prevents leak. It won't slide around because of the foam pad. But it's not designed to prevent 100% of your spills. If you throw it in a bag or hold it upside down, the liquid will come out.
Easy to carry, and easy for cleaning: It fits in a cup holder when you go to work or travel and it is easy to wash by hand, but not dishwasher, after all, it is bamboo outside. An Amazing Gift:It's a great personalized gift idea!