This insulated travel mug is double walled with a stainless steel inner wall and acrylic outer wall and holds 14 ounces. It fits in most vehicle cup holders and has both a locking lid and skid resistant bottom to help prevent spillage!This insulated travel mug is double walled with a stainless steel inner wall and acrylic outer wall and holds 14 ounces. It fits in most vehicle cup holders and has both a locking lid and skid resistant bottom to help prevent spillage! "Keep your beverage safe and secure on-the-go with our insulated travel mug! With a double wall design, stainless steel and acrylic construction, and 14 ounce capacity, you won't spill a drop (unless you want to, of course). And it's vehicle-friendly with its locking lid and skid resistant bottom. No more pesky spills on your morning commute!"