PrimulaPeak Hot or Cold Tumbler - Triple Layer Copper Technology Vacuum Sealed - With Matching Color Gift Box, 20 Ounce, Gunmetal

Keeps cold or hot a long time

I cannot believe how long ice will stay in this cup! After 24 hours the ice was still in it! Amazing!

Keeps coffee hot for a few hours and doesn't seem to leak much.

Stays cold really really long

I bought these mugs (4) at Xmas last year in a pack. I have been searching for more and found them on Amazon. Although I paid a much better price for four that I found on a home shopping network, this price for just one made me blink, but the mug is so great I forced myself to get this red one. Only complaint besides price is that I have never figured out how to get coffee or tea stains off the interior, I just love them, however they need to provide tips on this cleaning so it is a mug that you can offer to guests. It makes the mug look dirty when in fact they are clean. Overall it is a great mug to keep things hot or cold for hours.

This is the best hot/cold tumbler. It keeps liquids cold and/or hot all day long. You won’t regret purchasing one.

Great mug keeps drinks hot or cold for a long time and very reasonably priced.

It definitely works. I got one after a friend at work raved about how long it kept ice in her drink over the summer working in a hot greenhouse. My bf likes to make chilled protein coffee drinks to have throughout the day. But often forgets to put them back in the fridge or add more ice so a lot end up getting dumped. Now he can make a drink in the morning and leave it out and there will still be ice in it at the end of the day. He likes using a straw to drink so I purchased a set of 10" long x 0.3" wide reusable plastic ones. The opening on the tumbler is a bit wider than the straw and so the stopper ring on the straws won't work. Not a big deal for him but might be to other people.Disappointed in the online color/appearance representation. The image online for the Black Diamond shows a more muted black borderline dark charcoal color with a visible brushed steel appearance. In person it is a high gloss solid black. I get colors can be off a bit due to monitor differences but brushed steel vs gloss is not due to monitors.