SF TECH

SF Tech: a Swiss vision of technical drysuits

SF Tech was founded in Switzerland with a clear philosophy: to design drysuits capable of supporting years of technical diving. The brand primarily targets technical, rebreather, cave, and professional divers.

Manufacturing is based on strict control of materials, assembly, and finishing, with a strong focus on made-to-measure production. This approach delivers a functional fit, fully aligned with technical diving positions and complex equipment configurations.

TNT Technology: why it stands apart from conventional drysuits

The TNT drysuit range—including the SF Tech TNT Pro and SF Tech TNT Classic—is built around a composite material developed by SF Tech. This fabric combines some of the benefits of neoprene and trilaminate suits, without their most common drawbacks.

A unique patented material, TNT is based on a high-density Yamamoto neoprene trilaminate. Its key feature? The integration of two titanium layers that act as true thermal shields.

• Thermal comfort: up to twice the warmth of a conventional butyl trilaminate.

• Freedom of movement: the world’s first trilaminate with true 4-way stretch. More resistant than aramid alone, Dyneema fabric offers exceptional elasticity, providing total freedom of movement with no restrictive feel, for a total weight of around 4 kg (varies by model).

• Kevlar® and UHMWPE (Dyneema) armor: protection using a blend of aramid fibers (DuPont™ Kevlar®) and high-performance polyethylene (UHMWPE).

Unlike traditional trilaminate fabrics, TNT provides:

• Natural flexibility that follows the diver’s movements

• Improved air volume management, without excessive buoyancy shift

• Excellent stability during finning and horizontal trim phases

* Unlike petroleum-based neoprenes, Yamamoto neoprene is manufactured from 99.7% limestone.

The lifespan of the drysuit is reinforced by Kevlar integration in high-stress areas such as shoulders, knees, and contact zones. This technical choice directly addresses the constraints encountered in cave, wreck, and advanced technical diving.

Comparative table of the SF Tech range

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SF Tech made-to-measure drysuits: a fit designed for technical diving

SF Tech is widely recognized for its expertise in custom drysuits. This is not a simple size adjustment, but a design process that integrates:

• Horizontal diving posture

• Sidemount and rebreather configurations

• Internal air management during long dives

• Reduction of stress points on seams

This precise fit improves stability, limits premature wear, and facilitates access to equipment—points frequently highlighted by experienced divers on specialized forums.

How SF Tech made-to-measure drysuits work

Choose the precision of SF Tech custom tailoring. Because a drysuit must perfectly match your body shape and diving practice, every SF Tech model is made to measure.

To guarantee a flawless fit, accurate measurements are essential. All measurements must be taken in store to ensure optimal precision.

IMPORTANT: During the fitting, you must bring your thickest undergarment (approximately a 400 g thermal undersuit).

By appointment only 220 allée René Higonnet, 26760 Beaumont-lès-Valence, France

Heating and thermal management: the SF Tech range

Cold management during long decompression stops is a recurring topic in the technical diving community. SF Tech has developed a complete integrated heating system capable of powering:

SF Tech heated gloves

Unlike traditional bulky heated gloves, this model uses a thin, breathable technical fabric that preserves maximum tactile sensitivity—essential for handling boltsnaps or reels during technical dives. Heat is evenly distributed across the back of the hand and along each finger, ensuring optimal blood flow to the extremities.

* SF Tech heated gloves connect directly to the suit’s internal wiring via standard jack connectors, allowing them to be used alone or in combination with heated pads. Each glove delivers 10 W, for a total of 20 W per pair, providing consistent warmth even during extended decompression stops.

SF Tech body heating pads

SF Tech heating pads feature a modular design, allowing divers to adapt their thermal protection to their needs. Unlike fixed integrated systems, these heating pads can be individually removed or replaced by the user. Made from a breathable material, they promote moisture transfer to outer layers, keeping the skin dry while delivering active heat.

Integration is completely seamless: cables and elements are concealed within the lining of the brand’s undergarments, ensuring unrestricted movement.

* A set of four SF Tech heating pads provides a total output of 40 W (10 W per element) at 12 V. With a 23.8 Ah battery, the system offers approximately 7 hours and 15 minutes of runtime.

SF Tech heating system batteries

Available in two versions, rated for depths of 100 m or 200 m. The sealed anodized aluminum and Delrin housing ensures long-term waterproof integrity, while a three-position magnetic switch allows heat intensity adjustment underwater—even with thick gloves.

* An integrated LED on the head displays real-time charge status. The electronics automatically detect E/O cable disconnection to cut power, protecting connectors from electrolysis. The battery also features a second output port, allowing simultaneous connection of an umbilical lighting system in addition to the heating system.

With a capacity of 23.45 Ah, the battery provides extended runtime—essential for decompression stops in cold water.

Cable pass-throughs are designed to remain watertight, even during long and repeated dives. This modularity allows the suit to be adapted to extreme conditions, including very cold water environments.

In addition, the use of SF Tech technical undergarments—such as Polartec Power Stretch—is frequently recommended to maintain thermal insulation while preserving full freedom of movement for technical diving.

This includes SF Tech drysuit undersuits, as well as SF Tech sweaters and pants.

SF Tech drysuit pricing, maintenance, and long-term value

The price of an SF Tech drysuit reflects a long-term investment choice. These suits are designed to be maintained, repaired, and modified throughout their entire lifecycle.

They are fully serviceable in an SF Tech workshop, where it is possible to:

• Replace a dry zipper

• Change neck seals or wrist seals

• Modify boots as diving practices evolve

By choosing a premium SF Tech drysuit, you are investing in durable equipment that will reliably accompany you for many years, dive after dive.

Maintenance of an SF Tech drysuit

For routine care, regular rinsing of the valves and proper zipper maintenance are sufficient to preserve watertightness and reliability over many years of use.

Collaboration × SF Tech

SF Tech supplies equipment to Special Forces, Police units, Firefighters, and Military organizations. The brand also collaborates with prestigious exploration and research teams such as Under The Pole, Laurent Ballesta during the Gombessa III expedition, the CNRS, as well as many other key figures in the technical diving world, including Xavier Meniscus.