Stainless steel
"I love the positive messages. It keeps my drink cold for hours. I had a very hard time lifting the part you drink out of and it won't fold back in but perhaps I got a defective one or i just can't get it to pullout and fold in."
Overall rating: 4.5 / 5 from 2 reviews.
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Makes me smile
"I had bought one in a store and absolutely love it. I get compliments everywhere I go with it. I liked it so much that I bought a second just in case I would lose it or mess it up somehow. Always good to have a back up."