ZojirushiSX-FA45-GZ Stainless Steel Tumbler with Lid, Rotary Open and Close Lid, Heat Retention, Office Work, Home Time, 15.9 fl oz (450 ml), Ash Green

I'll get straight to the point: when I fill this tumbler at 6PM with hot water to brew tea, that tea is still piping hot at 11PM, and luke warm at around 2AM. Considering I brew a giant pot of water every evening at around 6PM for my coffee, this cup essentially allows for me to save on electricity because I do not have to brew a separate pot of hot water later in the evening, when I am done with my coffee and want a cup of tea.For comparison, my coffee in an "insulated" stainless steel mug--with lid--becomes luke warm after about an hour in the mug.Zojirushi's vacuum insulation works. You are getting exactly what you're paying for, and the brand is worth every penny.

It keeps my coffee hot but the 3-piece lid is a bit of over-engineered ridiculousness. Why not just a screw-on cap?

I have several of these cups and they truly keep your hot or cold beverage for a very long time. It is quite expensive but you will find you will never use anything else once you have this in your possession.

Best vacuum tumbler/cup that I have owned.

This cup keeps my coffee hot for the longest time. I just ordered a second one to give as a gift.

Very well made. Very light but keeps my coffee warm almost all day. 👍

Light weight, holds a good amount of liquid, nice color, seems durable.