It’s a “insulated” tumbler. This was another Dollar Tree, maybe even Big Lots buy for my wife from her own folks. It’s a solid negative 5 out of 5 stars. Why you ask? Look at the right cup part. this is the outer sleeve. Notice the roughness at the rim? Yeah. that’s supposed to be permanently attached to the left side. Looks like they bought it, screwed it so tight that it broke and then gifted it to their own daughter, who I must add is one of the nicest people on the planet that devotes herself to trying to please them.