Wind Core Peltier Vest Ice ✖️ Heater Condition: Worn once for a few hours. [Color] Black [Size] Free Size Tohoku University Hospital supervised Peltier wear, 2024 model. Instant cooling/heating of the body in 3 places. Maximum cooling: approx. -23℃ Maximum heating: approx. +39℃ Free size design that fits body types from S to 5L size (chest 80-124cm) Equipped with a fluctuating function that repeats ON/OFF at regular intervals. Operating time (approximate when using the included dedicated battery) Ice Mode: Strong 4.5h Weak 6.5h Fluctuation 5.2h Heater Mode: Strong 12.3h Weak 24.6h Fluctuation 14.3h Battery capacity: 3.7V 20000mAh With zippered battery pocket By wearing it in combination with fan-equipped wear, you can experience coolness more effectively. I wore it once, but it didn't suit me, so I'm selling it. I purchased it from a nearby Workman shop.