TRAMONTANA
The lightweight back-cooling vest
A single active thermal circuit, focused where the body sheds heat best: the back. The same patented technology as Tempesta, tailored for people who move all day.
The lightest of Tethys' active thermal systems. A PU foam core, one back circuit, one button. Enough to make the whole day bearable, on the move or at the workstation.
🗎 User manual (PDF · 1.2 MB)Fatal work accidents possibly linked to heat recorded in France in summer 2025 — mainly construction, public works and agriculture.
Source: Santé publique France, summer 2025 reportThe cost of a single day above 30°C for the German economy, nearly doubling above 35°C — productivity accounts for 97% of the losses.
Source: Prognos / Handelsblatt, July 2026Heat-related emergency care visits during summer 2025 in France — hyperthermia, dehydration, collapse at the workstation.
Source: Santé publique France, summer 2025 reportHEAT DOESN'T WAIT
FOR YOU TO STAND STILL
Delivery drivers, forklift operators, maintenance crews, logistics teams: jobs in motion combine physical effort with long exposure — and rarely tolerate heavy equipment all day. Tramontana treats the problem on the back, close to the body, without weighing on the movement. One active, discreet circuit that lasts the day.
BACK COOLING,
ZERO MOBILITY TRADE-OFF
LIGHT
Under 900 grams including system and battery — nearly twice as light as Tempesta. Tramontana can be worn for hours with no added fatigue, even in constant motion.
DISCREET
Under 3 cm thick and under 48 dB: Tramontana slips under or over workwear and disappears — at the workstation and on the move.
AUTONOMOUS
74 Wh USB-C battery: over 3h30 of runtime, with a second battery set available to cover the full day without taking the vest off duty.
THE SAME SCIENCE,
FOCUSED ON THE ESSENTIAL
DORSAL CIRCUIT
All the thermal power is dedicated to a single exchange zone, held against the back, where the contact surface is widest and most stable, even in full effort.
PATENT WO 2024/141723
Tramontana carries Tethys' patented active heat-exchange technology, born from space and nuclear programmes and already field-proven with Tempesta.
WATER, SIMPLY
The working fluid is water: nothing to freeze, no refills to buy, no cold-recharge logistics. The circuit asks nothing of you, season after season.
AUTO CUT-OFF 50°C
In heat mode, the system takes an automatic two-minute pause at 50°C. Built-in protection, always on, with no user action required.
TRAMONTANA
FROM EVERY
ANGLE
SOFTNESS,
UP CLOSE
You can't touch it through the screen — so look at it very closely. Tramontana's core is a PU foam sandwich structure: it houses the thermal circuit, hugs the back and absorbs movement, with no hard points or edges.
It's what gives the vest its soft, silent contact — the feeling of equipment that works without ever reminding you it's there.
Hover to zoom
Hover to zoom
Hover to zoom — PU foam ×4
Polyurethane foam — macro surface, ×4 magnification under the lens
THE SYSTEM’S REAL
ARCHITECTURE
Technical reproduction of the Tramontana system — Peltier modules, microfluidic circuit, pumps, ventilation and integrated control electronics.
Click the markers to explore each component
SPECIFICATIONS
| Total weight | < 900 g |
| Max thickness | < 3 cm |
| Thermal power | 30 W (system) |
| Power supply | USB-C battery 74 Wh · 15 V |
| Battery life | > 3h30 (second battery set available) |
| Operating range | −20°C to +50°C |
| Working fluid | Water |
| Noise level | < 48 dB |
| Heat-mode safety | Automatic cut-off at 50°C (2-min pause) |
| Sizes | M · L · XL |
| Care | Vest layer machine washable (delicate) · system sponge-cleaned |
| Warranty | 2 years |
| Patent | WO 2024/141723 A1 |
BUILT TO LAST
THE WHOLE DAY — AND BEYOND
NOMAD POWER
- 74 Wh · 15 V USB-C battery, housed in the side pocket: nothing sticks out, nothing gets in the way.
- Fully charged, it delivers over 3h30 of continuous runtime.
- A second battery set is available: the relief is ready before the break.
NO-PROTOCOL CARE
- The vest layer goes in the washing machine, delicate cycle — tumble drying allowed.
- The system layer wipes clean with a sponge and mild soap, in a few gestures.
- Simply remove system, button and battery before washing: no specialised maintenance.
TWO ANSWERS,
TWO NEEDS
| TRAMONTANA | TEMPESTA | |
|---|---|---|
| Designed for | Mobility: extended wear, free movement, lightness | Full thermal comfort under intense exposure |
| Treated area | Single back circuit | Chest + back coverage |
| Thermal power | 30 W | 50 W |
| Weight | < 900 g | 1.6 kg |
| Battery life | > 3h30 | 3h30 (hot-swap batteries) |
| Sizes | M · L · XL | XS-S · M-L · XL-XXL |
Both vests share the same patented technology (WO 2024/141723), the same central-button control — six modes, two cooling and two heating levels — and integrate with existing PPE. Need help choosing? Describe your workstation — we recommend the right configuration within 48h. See also the Tempesta page.
TRY TRAMONTANA
ON YOUR SITE
Monthly rental, annual rental or purchase: three acquisition modes, personalised quote within 48h.