Two men wearing Tempesta cooling vest

THE Thermal Confort for all

THE PORTABLE, REVERSIBLE THERMAL VEST

TETHYS

Workers exposed to extreme conditions : fatigue, errors, stoppages…

Every year, 8.9 million professionals in France suffer the effects of extreme temperatures, causing up to 8,000 in lost productivity per person.

At TETHYS we meet this challenge by placing worker safety, well-being, and performance at the heart of innovation. Our Tempesta system, derived from space and nuclear technologies, is the smallest thermal management system ever designed. It is available as a stand-alone, belt-worn version, or discreetly integrated into PPE, for optimum protection in all conditions.

TEMPESTA VEST

Reversible

Tempesta is capable of both heating and cooling, enabling it to deliver lasting improvements in thermal comfort, even under the most extreme working conditions.

Patented

Tempesta is protected by an international patent filed in 2023, under number WO2024/141723.

Learn more

Tested and Approved

Tested by 35 companies in the metallurgy, construction and energy sectors energy and urban services sectors.

Comfortable

Lightweight and compact, the Tempesta vest can be worn with any type of professional outfit all day long.

DEMO video

PERFORMANCE & SAVINGS

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Saved per worker per year

0%

operational savings

€5 billion/year

0%

to reduce health and accident costs

€8 billion / year

0%

increase in productivity

€44 billion/year

Sources: International Labour Organization (ILO), Ensuring safety and health at work in a changing climate, 2024. Tethys estimates applied to the European market.

Read the ILO report →

Made in Europe

Our vests are designed and manufactured in France and Italy, guaranteeing their quality and durability.

State-of-the-art technology

Our system is based on microfluidic circuits and built-in Peltier modules, ensuring comfort and lightness for the Tempesta vest.

A committed company

We assemble in France with our partner YMCA, a player in the social and solidarity economy.

TESTIMONIALS

SNCF

Environmental Director, TER General Directorate – Innovation

The cooling vest provides highly efficient and rapid cooling while remaining surprisingly lightweight. The batteries deliver excellent autonomy, ensuring confident and uninterrupted use over time. We see strong potential for a number of operational roles.

Eiffage

Agency Director

Our team was convinced by the vest’s potential. We appreciate the quality of the device, the responsiveness of the team, and their commitment to continuous improvement.

GSF

Innovation Department

“…” The results? Very promising! The V2 is even more ergonomic, washable, and now reversible for hot/cold use. “…”

GSF

QHSE Manager

Tested in the field, the vest was very well received by our teams, particularly by operators working in freezer environments, who noted a decrease in fatigue at the end of their shift.

SARPI-Veolia

Managing Director

Tethys' approach to personal thermal control represents an opportunity for us to strengthen the protection and comfort of staff working in areas of high thermal strain.

Veolia

Procurement & HSE Coordinator, Hazardous Waste Treatment & Water Depuration

This vest delivers a genuine sensation of coolness lasting around 3h00 depending on battery condition. The vests were tested by our Grasse site, which allowed Tethys to refine the product before moving to commercial release.

FedEx

Health & Safety Manager

We'd like to move forward with renting the vests.

Framatome

Health and Safety Risk Prevention Engineer

The feedback is quite positive: the cooling sensation is clearly felt, the vest cools effectively. Areas for improvement remain, particularly on weight. We are keen to test the more advanced version.

DHL