The 22 oz tumbler is a great commuter’s mug for coffee and tea drinkers alike. Tenite Vacuum Tumbler is made of 18/8 SS liner with powder coating. Vacuum sealed to retain your beverage temperatures keep hot up to 8 hours, cold up to 12 hours. Built-in cork bottom to prevent scratching and staining on the wood desk or glass table. Perfect for travel, camping, hiking, etc. BPA FREE, FDA certified