Duracool

This Swiss Startup Says You Can Beat the Heat Without Air Conditioning or Electricity

Europe's summers are getting brutal. Nahtlos AG, a Swiss tech spin-off, developed Duracool—a wearable cooling vest that runs on water alone.

by Duracool Team

Europe's Summers Are Getting Brutal

Summer has transformed across Central Europe. Cities from Vienna to Zurich now experience extended heatwaves with temperatures exceeding 35°C and sometimes approaching 40°C. This shift presents genuine health risks, affecting concentration, cardiovascular function, and sleep quality. The challenge intensifies for elderly populations, individuals with chronic conditions, and those in poorly ventilated spaces or exposed to direct sunlight during work.

Hot weather city

Why Air Conditioning Isn't Always the Answer

Hot weather outside

Air conditioning appears to be an obvious solution but faces significant limitations. Most European residences lack built-in cooling systems, and retrofitting proves expensive while increasing energy consumption. The fundamental constraint remains mobility—wall-mounted units provide no assistance outdoors.

Portable fans offer minimal relief without actually cooling the body. Workers in construction, landscaping, delivery services, and other outdoor roles need solutions that travel with them, not stationary equipment.

The Old-School Science Behind a New Solution

Kids older man

Evaporative cooling represents an ancient principle applied to contemporary challenges. The human body naturally cools through perspiration and air exposure. Contemporary engineering applies this mechanism to specialized textiles that hold and gradually release water vapor, drawing thermal energy from skin and lowering temperature by several degrees without requiring electricity.

Meet Duracool: Wearable Cooling from a Swiss Tech Spin-Off

Couple home coffee

Nahtlos AG, headquartered in St. Gallen, Switzerland, developed Duracool—a product line descended from research conducted at Empa, Switzerland's national research institute. The cooling vests and shoulder pads operate through evaporative cooling mechanics requiring only tap water. Users fill the inner layers, seal the garment, and benefit from hours of cooling without batteries, electrical connections, or chemical additives.

The technology emerged from background research in health monitoring and biomedical textiles, resulting in ergonomic designs built for durability and practical daily application.

Real-World Cooling, Anywhere You Go

Construction workers

Duracool serves professionals and individuals facing genuine heat-exposure challenges—landscapers, healthcare workers, parents navigating urban environments during extreme temperatures. The vest requires no complex setup: fill with water each morning and wear throughout the day. Users report enhanced comfort, reduced fatigue, and improved focus whether in non-air-conditioned indoor spaces, outdoor recreation areas, or residential settings during heat events.

A Smarter, Greener Way to Beat the Heat

Happy man mobile

Duracool addresses climate adaptation through sustainable principles. Operating passively via water evaporation, the technology generates zero emissions, demands no electrical infrastructure, and avoids adding thermal load to surrounding environments. Unlike disposable alternatives or power-dependent wearables, Duracool functions repeatedly through simple water refilling—a genuinely renewable approach to personal thermal management.

Made in Switzerland, Designed for a Hotter Europe

Older man outside

The product represents Swiss engineering focused on practical accessibility rather than academic complexity. It accommodates diverse users: transit commuters, gardeners, mail carriers, caregivers, cyclists, and event volunteers. The design philosophy prioritizes simplicity—lightweight construction, intuitive operation, and integration into ordinary routines without requiring individuals to reduce outdoor activity when temperatures reach extreme levels.

Conclusion: Wear Your Cool

European summers demand innovative thermal management strategies. Duracool provides an accessible response: a wearable cooling system rechargeable with water alone, requiring no noise generation or environmental cost. Rather than waiting for urban tree planting initiatives or building retrofits, individuals can immediately address personal comfort through a single practical garment.

Learn more and explore the collection at duracoolwear.com

Vest in use

Frequently Asked Questions

What is passive cooling, and how does Duracool use it?

Passive cooling refers to reducing heat without energy input. Duracool uses evaporative cooling—your body's natural way of staying cool—to draw heat away through slow water evaporation embedded in its fabric layers.

Does Duracool require any power or batteries?

No. Duracool operates without electricity, batteries, or refrigeration. It's powered entirely by water, making it ideal for on-the-go cooling and off-grid environments.

How do I use the Duracool vest?

Simply fill the vest's internal layer with tap water, seal it, and wear it. The fabric releases the moisture gradually, producing a cooling effect for several hours. When it dries out, refill to continue using.

Who benefits most from wearing Duracool?

Duracool is ideal for anyone exposed to heat without access to air conditioning—gardeners, construction workers, healthcare staff, commuters, and seniors needing practical, low-tech cooling solutions.

Is Duracool eco-friendly?

Yes. Because it uses no electricity or emissions-producing systems, Duracool offers a sustainable alternative to traditional air conditioning, supporting climate-conscious living and energy independence.

Can I wear Duracool every day?

Absolutely. Duracool is lightweight, washable, and designed for regular use. It's perfect for daily wear during heatwaves, whether indoors or outside, without needing any special maintenance.