DOUBLE WALL VACUUM INSULATION DESIGN Vacuum-seal technology and double-wall construction Keeps HOT liquid and COLD liquid for 8 Hours SEALING Will not leak! The only mug with a vertical lid lock. Ensures no accidental spills and allows for convenient one-hand operation SAFE BPA-free lid and food-grade stainless steel mean there are no chemicals that can Drink with peace of mind EASY TO USE AND CARRY Fits most car cup holders for traveling or at the office, gym, school, camping, hiking Customer Service: Please don't hesitate to contact us if there is any problem. We will respond you under 24 hours and solve the problems for you.