Extreme Watersport

SANTI Flex 190 Undersuit

The SANTI Flex 190 Undersuit is a lightweight technical drysuit undersuit designed for divers who want outstanding thermal performance without unnecessary bulk. Featuring premium Climashield® insulation with AquaBan™ technology, it provides dependable warmth, excellent moisture management and unrestricted mobility beneath modern trilaminate and membrane drysuits.

Ideal for recreational, technical and sidemount diving throughout Melbourne, Victoria and other cold-water environments across Australia, the Flex 190 delivers versatile thermal protection while supporting an efficient layering system. Whether you're planning local shore dives or extended technical expeditions, it offers an exceptional balance of warmth, flexibility and all-day comfort.

Designed for Cold-Water Diving Made in Poland Custom Sizing Available
SANTI Flex 190 Undersuit

Choose Your Size

$1,150.00
Most sizes are supplied to order directly from SANTI. If your preferred size is not currently in stock, please allow approximately 6–10 weeks for delivery. Contact us for current availability or custom sizing options.
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Product Highlights

The Lightweight Technical Choice for Cold-Water Diving

The SANTI Flex 190 is engineered for divers who want a modern lightweight thermal system without compromising insulation. Using Climashield® insulation and AquaBan™ moisture management technology, it delivers reliable warmth while maintaining excellent flexibility for recreational and technical diving.

Its streamlined construction makes the Flex 190 particularly well suited to divers who prefer a modular layering system beneath trilaminate and membrane drysuits. Whether you're diving Melbourne's piers, Victorian wrecks or planning technical dives requiring extended bottom times, the Flex 190 offers dependable thermal performance with exceptional freedom of movement.

Key Features

Key Features

Climashield® Insulation

Premium 180 g/m² Climashield® insulation provides reliable thermal protection while maintaining exceptional flexibility and long-term durability.

AquaBan™ Technology

Advanced moisture management helps move perspiration away from the body, improving comfort and maintaining insulation during long dives.

Exceptional Freedom of Movement

Engineered for unrestricted mobility beneath a drysuit, making the Flex 190 ideal for recreational, technical and professional diving.

Made for Modern Drysuits

Low-bulk construction layers comfortably beneath trilaminate and membrane drysuits while maintaining excellent trim and flexibility.

Technical Details

Technical Specifications

The SANTI Flex 190 is a premium drysuit undersuit designed for divers seeking the ideal balance between thermal protection, flexibility and low bulk. Built using Climashield® insulation with AquaBan™ technology, it delivers dependable warmth while maintaining excellent freedom of movement for recreational, technical and professional cold-water diving.

Product
SANTI Flex 190 Undersuit
Insulation
180 g/m² Climashield® insulation
Thermal Rating
0.96 CLO
Recommended Water Temperature
Approximately 10–19°C (depending on dive duration, drysuit and individual cold tolerance)
Moisture Management
AquaBan™ technology improves moisture transfer and comfort during extended dives.
Best Use
Recreational, technical and professional drysuit diving
Compatibility
Suitable for trilaminate, membrane and compressed neoprene drysuits.
Sizing
Men's and Women's standard sizing with custom sizing available.
Country of Manufacture
Poland
Availability
Made to order for most sizes.
Included

What's Included

  • SANTI Flex 190 Undersuit
  • SANTI manufacturer's care information
Size Guide

Need Help Choosing Your Size?

Use the size guide below as a reference before ordering. If you are between sizes or plan to wear additional base layers, contact us and we can help recommend the most suitable fit.

Men’s Size Guide

SANTI Flex 190 Undersuit men’s size guide

Women’s Size Guide

SANTI Flex 190 Undersuit women’s size guide

Why Choose the SANTI Flex 190 for Technical and Cold-Water Diving?

The SANTI Flex 190 is a premium lightweight drysuit undersuit designed for divers seeking the ideal balance between warmth, flexibility and mobility. Built with advanced Climashield® insulation and AquaBan™ moisture management technology, it delivers dependable thermal protection while maintaining a streamlined profile beneath modern drysuits.

Unlike heavier expedition undersuits, the Flex 190 focuses on efficient thermal performance with reduced bulk. It is an excellent choice for recreational diving, technical diving, sidemount diving and divers who prefer a modular layering system that can be adapted to changing water temperatures.

Ideal for Melbourne, Victoria and Australian Cold-Water Diving

Whether you're shore diving around Port Phillip Bay, exploring the wrecks of Victoria, diving throughout Tasmania or enjoying year-round drysuit diving across southern Australia, the Flex 190 provides dependable warmth while maintaining excellent freedom of movement. Its lightweight construction helps reduce bulk without sacrificing the insulation needed for demanding cold-water dives.

Flex 190 vs KANGO: Which SANTI Undersuit Should You Choose?

The Flex 190 is designed for divers who prioritise lightweight performance and efficient layering, making it particularly popular with technical divers and those seeking maximum mobility beneath a drysuit. The KANGO, by comparison, uses premium Polartec® Power Stretch® fleece to deliver exceptional everyday comfort and flexibility. Both are excellent choices, with the ideal option depending on your preferred diving style, local water temperatures and personal thermal requirements.

Why Buy Your SANTI Flex 190 from Extreme Watersport?

As an authorised SANTI dealer in Australia, Extreme Watersport supplies genuine SANTI thermal systems supported by expert advice from experienced cold-water divers. We can help you compare the Flex 190 with the KANGO, BZ420X and heated SANTI systems, ensuring you select the most appropriate undersuit for your diving conditions, drysuit and future diving goals.

FAQ

SANTI Flex 190 Undersuit FAQ

Who is the SANTI Flex 190 designed for?

The Flex 190 is designed for recreational, technical and professional divers looking for a lightweight yet warm drysuit undersuit. It is particularly well suited to divers who want excellent mobility without sacrificing thermal protection.

What water temperatures is the Flex 190 suitable for?

The Flex 190 performs well in water temperatures around 10–19°C, although the ideal temperature range depends on your drysuit, dive duration, activity level and personal cold tolerance. It can also be layered with lightweight base layers or heated systems for colder conditions.

Can I wear the Flex 190 with any drysuit?

Yes. The Flex 190 is compatible with most trilaminate, membrane and compressed neoprene drysuits, including SANTI, Fourth Element, Waterproof, DUI, Otter and many other brands.

Is custom sizing available?

Yes. SANTI offers custom sizing for many of its undersuits. Contact us if you require a made-to-measure option or need assistance selecting the correct size.

Can the Flex 190 be layered with other thermal garments?

Absolutely. The Flex 190 works well over lightweight base layers and can also be combined with heated vests or additional thermal layers for colder dives or extended decompression diving.

Do you stock every size?

Some popular sizes may be available from stock, while many are supplied directly from SANTI. Contact us for current availability or expected delivery times.

Need Help?

Need Help Choosing the Right SANTI Undersuit?

Choosing the right drysuit undersuit depends on your diving environment, water temperature, drysuit type and personal cold tolerance. Whether you're deciding between the Flex 190, BZ400X or another SANTI thermal system, we're happy to recommend the best option for your diving.

Contact Us for Advice