This is essentially a regular bandana cut into two triangles (and hemmed, nicely), with an enclosed 'pocket' of what feels like gel powder in an approximately 1 x 8 inch 'band' along the forehead portion of the bandana. There is relatively little of anything special.  I may just use regular bandana's from the craft store, soak them in ice water, and let that evaporate... evaporation is the mechanism, along with whatever 'gel' is in the sewn in pocket.  I have severe heat intolerance, and have been looking for something to help when I have to leave home and am subject to the thermostats of stores and MD offices. Not sure this is it.  But, I haven't activated it yet, so who knows... I'll edit later when I do use this.  I've already shaved my head to eliminate heat from hair... I hope this bandana thing helps when I'm away from home.

It took quite a while to receive this- estimated delivery was January 24th at the latest; I contacted the seller on January 29th, and they sent this out the next day- arriving on Feb. 4th.  They did respond to my e-mail; not sure why there was a delay in shipping to start with.