30 oz Stainless Steel Tumbler By BaySea - Vacuum Insulated To Keep Drinks Ice Cold Up To 24 Hours And Piping Hot Up To 6 Hours - 100% Satisfaction DRINK STAYS DELICIOUS FOR HOURS: tired of lukewarm coffee or melted ice cubes? your baysea stainless steel tumbler keeps drinks hot for up to 6 hours and ice cold for up to 24 hours. the secret is our premium construction: double wall vacuum insulation guarantees maximum temperature retention! BUILT TO LAST A LIFETIME: your baysea tumbler is manufactured from durable 18/8 stainless steel. this rust-proof steel is so strong, so reliable, you could still be using this tumbler decades from now! NO SWEAT NO STAINS: thanks to its double wall vacuum insulation, your baysea stainless steel tumbler is always cool and dry to the touch  no matter the drink. finally, a tumbler that doesn't sweat droplets and leave water stains everywhere! CLEAN-UP IS A BREEZE: to clean your baysea tumbler simply wash it with soapy water and let it air dry. avoid using a dishwasher. the heavy-duty construction of this stainless steel tumbler is not safe for your dishwasher and glassware. LIFETIME MONEY-BACK GUARANTEE: we're 100% confident you're going to love your new baysea stainless steel tumbler. in fact, we're so confident in your satisfaction we proudly offer this tumbler with a lifetime money-back guarantee. yeti, rtic, and other big brands don't offer a guarantee this strong!