The air itself gets hot
They pull in outside air to dry sweat. Above 35°C, what flows through the garment is hot air.
HEATSTROKE PREVENTION SPECIALISTS ｜ SINCE 2011
The 40°C era is here.
The 40°C era is here.
Cool from the core.
The Human Air Conditioner is wearable cooling that draws heat straight out of the body with chilled water. Designed in Osaka by CoolSmile — pioneers of mass-produced flat water-cooling clothing, focused solely on heatstroke prevention since 2011.
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2011Founded in Osaka, Japan
2015Mass-production model unveiled
15 yrsDedicated to heat safety
Made forConstruction, factories, care
Why water cooling
Willpower and airflow
are no longer enough.
Days above 40°C are becoming more common every year. When air temperature approaches body temperature, most cooling products lose their edge.
The chill doesn't last
In humid summers, evaporation slows down. The effect is temporary and doesn't lower core temperature.
Chilled water absorbs heat directly
Independent of outside temperature, chilled water keeps drawing heat from the body — even on a 40°C site.
Technology
What is flat water cooling?
Developed by CoolSmile, our system runs water through thin, flat cooling panels instead of conventional tubing. Because the panels contact the body as a surface, they remove heat evenly across a wide area.
- 1Wide cooling area — wraps the torso for efficient heat removal
- 2Swappable bottles — replace frozen bottles or ice for continuous use
- 3Engineered for the human body — placement, flow and temperature designed by heat-safety experts
Products
Choose the right fit for your site
ALL-IN-ONE
Human Air Conditioner A2
Pump and bottle integrated into one garment. Designed in Japan.
HEAVY DUTY
Human Air Conditioner K2
Compatible with full-body harnesses. Built for demanding sites.
HEAD COOLING
Helmet Air Conditioner
Continuous head cooling. Pair with the Human Air Conditioner for full-body relief.
ConstructionShipbuildingFactoriesSecurityNursing careEvents & costumesMotorcycling
Trust & Track record
Built by heatstroke
prevention experts.
Our mission is to bring relief to everyone who suffers from heatstroke. We began in 2011, after the Great East Japan Earthquake, developing cooling garments for people working on reconstruction sites. Yuzo Nakanishi, Founder & President
NEW Environment ExpoGlobal Warming Prevention ExpoExtreme Heat Countermeasures ExpoJapan International Welding ShowOsaka Motorcycle Show
- 2011Founded. Began developing cooling garments for reconstruction workers
- 2012Announced the CoolSmile water-cooling unit
- 2014.03Exhibited a water-cooled "Motorcycle Air Conditioner" prototype (CS501B) at a motorcycle show
- 2015.07Unveiled our mass-production water-cooled garment at a trade show
- 2015.10Began shipping mass-produced units (CA2, CS303)
- 2023Adopted across general workplaces and homes; exhibiting nationwide
- 2024Launched A1 & A2; featured in industry press; donated units for Noto earthquake relief
- 2025Expanded into construction, shipbuilding and nursing care
- 2026Heatstroke prevention seminars for companies and organizations
!
Beware of low-cost look-alikes
Similar-looking water-cooled garments have appeared in recent years. Where to cool, how much water to circulate and at what temperature cannot be designed without heatstroke expertise. Poorly designed products may not only fall short — they can introduce unexpected risks.
FAQ
Frequently asked questions
How is water-cooled clothing different from fan-equipped cooling vests?
Fan-equipped clothing blows outside air through the garment to evaporate sweat. As the air temperature approaches body temperature, that air becomes hot and the effect drops. Flat water-cooling garments circulate chilled water through thin flat panels that absorb body heat directly, so cooling continues even near 40°C.
Do you ship overseas or work with distributors?
Yes. We welcome inquiries from overseas companies and distributors. Please contact us with your country, quantity and use case.
Videos
See it in action
Real worksites, real users — watch how water cooling performs.
Official MV: Human Air Conditioner
Shipyard heat safety with the Helmet Air Conditioner
Cooling nurses on home-care visits
Helmet Air Conditioner — THE FIRST TAKE style
Contact
Let's beat the heat on your site.
Bulk orders, distribution partnerships and seminars — we'd love to hear from you.