The coffee mug body is made of high-quality stainless steel, lid is made of food-grade silicone, PP, totally BPA-free. The silicone seal on the lid provides a good leak-proof effect. With slip proof rubber pad at the bottom of the vacuum travel mug, can effectively prevent the coffee cup from sliding and overturning. The travel mug for hot drinks fits most cupholders, great for use at home, at office, car driving, on the go etc. 13oz capacity, enough to help you stay hydration. Perfect size to put in bagpack bicycle and car cup holder.