The original Keep Austin Weird neoprene collapsible drink sleeve.
SO, let's discuss... what is neoprene? Neoprene is what scuba divers wear. If you are searching for "the good ones," the ones that last longer, insulate better, and keep their shape, this is what you are looking for.
Imprinted on both sides. Item Dimensions: 3.75" W x 5.125" H ( Flat )