This large travel mug made of stainless steel features double walled vacuum insulation & a solid ergonomic handle, allowing for fewer refills on the go. The sophisticated lid has a straw opening that is splash-proof. It fits in any standard cup holder with a 3" diameter bottom. Drinks stay hot for up to 12 hours and cold for up to 30! This product is free of BPA, phthalates, lead, and toxins. These are made of FDA-approved food-grade stainless steel & comply with California Proposition 65.