●LEAK-PROOF: Our patented slider lid creates an interior seal, ensuring 100% leak-proof and splash-resistant performance making it the ultimate commuter companion. ●STAYS HOT OR COLD: Vacuum insulated stainless steel keeps drinks cold up to 10 hours and hot up to 5 hours. ●COMMUTE COMPANION: Equipped with a friction-fit slider lid that lets you drink directly from the tumbler and the silicone boot acts as a built-in koozie. Tumbler is splash-resistant. ●EASY TO CLEAN: Lid is top rack dishwasher safe and handwash body recommended. All parts are BPA-free. ●CUPHOLDER FRIENDLY: Built-in cork composite coaster base protects surfaces and fits in most cup holders with 3inch base width.