I believe they were called Kingston coolers. One of those under a legit, wool cooler remains the very fastest way to dry a horse.
I have a proper one I’d sell you. By “proper,” I mean white, shrunken, holey, all-around shiity, but will do the job, and cheap!
Shoot me a PM with a textable number and/or email addy where I can send you pictures, and I’ll hook you up.