Free-size cool vest with instant cooling to -28°C and instant heating to +39°C. I bought this as a gift for a friend, but they said they wouldn't use it, so I'm reluctantly putting it up for sale. - Brand: WindCore - Model: PRO model - Function: Cooling/Heating - Cooling Temperature: Max -28°C - Heating Temperature: Max +39°C - Size: Free Size - Cooling Speed: Fastest 1 second Thank you for looking.