Thank you for viewing. This is the "Workman 2024 Model Wind Core Ice x Heater Peltier Vest PRO." I have used it a few times, but it doesn't fit me, so I am selling it. ⚫︎Color: Black ⚫︎Size: Free ⚫︎Material Main body: 88% polyester, 12% polyurethane Mesh part: 100% polyester Instant cooling/heating of the body in 3 places! All-season air conditioning clothing! Largest area Peltier wear! ●Product Features● ●Sustainable comfortable work! Collaboration with specialized companies and leading universities! ・Peltier wear based on verification tests supervised by Tohoku University Hospital ●Cool in the summer! ・Amazing speed cooling ・Up to about -23°C <surface temperature about 2°C> (※Temperature difference from the device surface temperature when the ambient temperature is about 25°C) ●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) ●New function! Added fluctuation function ・Stops for 1 minute when operating for 5 minutes. Function that repeats ON/OFF ・Reduces sudden cooling and heating! ●Adjustable in 3 modes each for heating and cooling ・Adjustable in 3 stages: strong/weak/fluctuation ・Peltier devices are installed on the front and back, efficiently cooling and heating the body ・Comes with a 20,000mAh battery ●Continuous operating time of the included battery ・ICE mode Strong: 4.5 hours Weak: 6.5 hours Fluctuation: 5.2 hours ・HEATER mode Strong: 12.3 hours Weak: 24.6 hours Fluctuation: 14.3 hours ●Fits various body types! ・Free size design that supports S~5L sizes ・Easy to move around because it uses stretchy fabric! ・Prevents slippage and enhances the fit to the body by adjusting the front and side belts