Ah Janet; just realised the brand name is actually ‘kool Tie’.
It contains some kind of crystals which when soaked in water will help to keep the body cool for quite a long time. My friend who used to be a nurse tells me that the ‘cool tie’ I was wearing yesterday would have cooled an artchery in my neck. As I said, I am sure the ‘cool vest’ works a lot better.
I read about them on this site; when I googled ‘cool vest’ this is what I came up with.
A cooling vest or ice vest or “precool vest” is a piece of equipment worn to cool a person down. Cooling vests are used by many athletes, industry workers, doctors, working dogs, people with Multiple Sclerosis or Hypohidrotic ectodermal dysplasia****, and by military pilots and tank crews.