Review on Acqua Cooling Collar Carafe Color by Cre Soto

I didn't actually take the carafe out except to pour a glass, so I can't say the collar keeps the liquid cool, but I left the collar on when I poured the freshly brewed sun tea in the carafe, and it took forever to cool in the fridge. I had to remove the collar and put it back on once the liquid had cooled. Based on that, I think it should insulate well.