This is THANKO's "Overwhelmingly Cooling Refrigeration Suit 2". It has a cooling effect of up to -15℃ from the ambient temperature, and directly cools the back with an extreme cold plate and a strong wind fan. It uses a PELTIER COOLING system, which is the same cooling system as a refrigerator. It is washable and one size fits all. [Brand] THANKO [Features] Extreme cold plate, strong wind fan, PELTIER COOLING [Cooling Effect] Up to -15℃ from ambient temperature [Coolness Levels] 3 levels [Airflow Levels] 3 levels [Size] One size fits all [Other] Washable Notes: Only items shown in the photos will be shipped. (I have lost the instruction manual.) Notes: The warranty expired over a year after purchase. Please do not purchase if you do not understand used items, are overly sensitive, or have poor ratings. We may cancel your order in some cases. Thank you for your understanding. This item is also listed on other sites, so please be aware that it may be sold out or suddenly removed. No returns, no refunds, no complaints (3N).