The active professional cooling vest
Active thermal management system - Actively heats & cools. Integrates into any PPE. Made in Europe.
The most compact active thermal system ever deployed in the field, designed to fit existing PPE.
Download the user manual (PDF · 3.1 MB)Costs of heat stress in the workplace worldwide, according to the ILO
Workers exposed to thermal extremes in France, across the construction, metallurgy, logistics and energy sectors
Reduction in workplace accidents observed among Tempesta clients in extreme summer conditions
Where passive gel vests melt, overheat, or require heavy recharging logistics, Tempesta delivers real-time bidirectional thermal control with no interruption to activity.
The Peltier thermoelectric module transfers heat from one face to the other depending on the direction of the electric current. The result: bidirectional active cooling or heating, with no compressor and almost no noise.
Technology originally developed for the thermal management of satellites and nuclear reactors. Transferred and patented by Tethys for terrestrial industrial applications through the ESA BIC program.
2 front 10,000 mAh batteries. Hot-swapped in 10 seconds without interrupting activity. Universal USB-C charging. 3.5 h battery life per battery depending on the selected thermal mode.
International patent filed under the PCT system - protection in 154 signatory countries. Covers the entire active microfluidic integration system for PPE. Secured intellectual property.
Tempesta is built on two independent thermo-fluidic circuits: one dedicated to active cooling, the other to heating. Each circuit is driven by Peltier-effect modules - technology born from space instrumentation and embedded nuclear systems.
The heat-transfer fluid circulates in a closed loop through a network of micro-channels integrated into the back of the vest. Within seconds of activation, the wall temperature reaches the target setpoint. No gel, no reservoir, no logistical constraints.
Why is Peltier superior?
Unlike passive gel vests, the Peltier effect enables continuous heat exchange without progressive loss. The temperature remains stable for the entire duration of the operation - 3.5 hours on a full charge.
The central button shared across the Tethys range, on the chest of the vest. Click to cycle through the six modes — the ring takes the colour of the active mode, readable at a glance even with gloves.
System powered down. A long press wakes the vest.
Visual simulation — ring colours as per the user manual
Full charge of both removable batteries in under 90 minutes via a universal USB-C connector. Compatible with any Power Delivery charger on the market - laptop, smartphone, mobile station.
The electronic system is removable in 30 seconds. The textile layer machine-washes at 30°C like standard PPE. The technical components (Peltier, batteries, circuits) stay protected and durable.
Drag the slider to simulate the thermal mode. See the temperature delta in real time.
Visual simulation. The actual system automatically adapts to body and ambient temperature.
| Criterion |
TEMPESTA
TETHYS V2
|
Passive gel vest |
|---|---|---|
| Active cooling | ✓Peltier effect - continuous | ✗ |
| Active heating | ✓Reversible - same unit | ✗ |
| Temperature control | ✓Central button - real time | ✗No control possible |
| Effective duration | ✓3.5 h continuous - rechargeable | ✗45–90 min, then useless |
| PPE compatibility | ✓<10 mm - universal | ✗Incompatible thickness |
| Maintenance & logistics | ✓USB-C charging - hot-swap | ✗Daily freezing required |
Note: ATEX certification currently under evaluation. For explosive-atmosphere environments, contact us for a case-by-case assessment.
Full thermal comfort: chest + back coverage, 50 W, hot-swap batteries. For intense, extended exposure.
Lightweight back cooling: a single circuit, under 900 g, one button. For mobility and extended wear. Discover Tramontana →
Need help choosing? Describe your workstation — recommendation within 48h.
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