The perfect travel mug for commuting to the office, school, attending outdoor activities or just relaxing at home. Whether you're an all-day coffee, tea or water drinker or a morning smoothie lover, a thoughtfully designed safety lock lid makes it spill proof. The flip top can be opened with one hand and the unique exterior design is easy to grip. Keep liquids hot or cold for at least 6 hours to 12 hours depending on starting temperature. Our stainless steel mug features a unique slim exterior design which can fit most cup holders and a removable spill-proof, ice-stopping insert for convenience.