Brand new, unopened With proof of purchase I use it myself, and it's really good! ● Product Features ● Japan Meteorological Association Heatstroke Zero Project official item Cool in the summer ・Amazing speed cooling ・Up to about -28°C (surface temperature about -3°C) (※When the ambient temperature is about 25°C, the temperature difference from the device surface temperature (according to the manufacturer)) Warm in the winter ・Amazing speed heating ・Up to about +39°C (surface temperature about 49°C) (※When the ambient temperature is about 10°C, when wearing outerwear outside the vest) Workman's most ever! 5 Peltier elements ・Equipped with a total of 5 Peltier devices: 1 on the back, 2 behind the waist, and 2 on the front ・Experience coolness/warmth over a wider area! New function! Dial Moving Adjuster ・Turning the dial on the right chest allows you to adjust the position of the two Peltier devices behind the waist up and down ・You can change the cooling position, so you can feel the cooling/heating continuously! Adjust to your preferred temperature ・You can switch between 4 cooling modes and 2 heating modes, supporting fine temperature adjustments Fits sizes S~5L (chest 80~124cm)! ・Free size design that fits various body types ・Made of stretchy fabric for easy movement ・Prevents slippage and enhances the fit to the body by adjusting the front and side belts ・If the front belt is too tight, you can remove the lower belt and wear it ～★Correct combination to enhance ICE mode effect★～ ① Compression or other thin innerwear × Peltier vest ② Compression or other thin innerwear × Peltier vest × Fan-equipped wear ③ Compression or other thin innerwear × Peltier vest × Wear with high breathability on the back ※If you wear clothes over this product, wearing poorly breathable wear may trap heat Material Body: 90% polyester, 10% polyurethane Mesh part: 100% polyester