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Halcyon Undersuit Flex 80 Undergarment

Halcyon Undersuit Flex 80 Undergarment

4.9 from 1100+ reviews

$700.00

  • Free shipping on orders over $150
  • Local pickup available at Bondi store
  • 30-day returns on unused items

SizeXS

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  • The layer that actually keeps you warm — not the shell
  • Loft matched to Sydney winter and to your suit
  • Heated options for long or deep dives
  • Fitted with your drysuit so nothing bunches or binds
Description

SANTI Flex 80 - A Fresh Take on Lightweight Comfort


The Flex 80 returns in an updated version - featuring a modernized design while maintaining the same trusted comfort that divers have come to love. This lightweight and highly flexible undersuit, ensuring excellent moisture wicking, fast drying, breathability, and outstanding resistance to pilling and snagging.


It's the perfect choice for divers seeking maximum freedom of movement and comfort during warm-water dives, or as an extra layer under a thicker undersuit in transitional seasons.


What stays:

  • Super-flexible fabric - for exceptional fit and comfort
  • Lightweight and breathable construction
  • Cut and features that support movement and active diving


What's new:

  • A refreshed, modern design
  • Updated finishing details and branding aesthetics


Key features:

  • High stand-up collar for extra thermal protection
  • Elastic cuffs to prevent sleeves from riding up
  • Adjustable waistband with internal elastic band
  • Two-way diagonal zipper for convenience
  • New branding elements: SANTI logo on the chest, sleeve, back


Technical Specifications:

  • Black Fabric:
  • Composition: 91 % polyester, 9 % elastane
  • Weight: 290 g/m²
  • "Scale" Fabric:
  • Composition: 100 % polyester
  • Weight: 300 g/m²


Flex 80 - trusted comfort, now in a new style.

Shipping
Free shipping on orders over $150. Local pickup available at Bondi Beach. International shipping calculated at checkout.
Returns
30-day return policy on unused items in original packaging. Custom-fitted gear is non-returnable.
Halcyon Undersuit Flex 80 Undergarment

Your drysuit doesn't keep you warm — this does

A drysuit is a shell. What keeps you warm is the loft underneath it, and getting that layer right is the difference between enjoying a winter dive and counting down the minutes.

We stock the Santi and Fourth Element ranges we dive ourselves, from merino base layers through to heated systems for long decompression and rebreather dives. Thicker is not automatically better — an undergarment that's too bulky compresses, kills your fit and drives your weighting up.

Come in with your suit and we'll match it properly. It's a five-minute conversation that saves a lot of cold diving.

Our Client reviews

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4.9

Based on 1100+ reviews

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Frequently Asked Questions

Find answers to common questions about our gear, courses, and policies.

Which drysuits can I buy off the shelf?

The Avatar Airon and the Bare Aquatrek Evo are our off-the-shelf suits — you can be diving one straight away.

How long does a made-to-measure suit take?

It depends on the brand. Navyfel is about 4 weeks, Bare about 8, Santi 8 to 10, and Fourth Element around 16. If you have a trip booked, work backwards from that date and come and talk to us early.

Which drysuit should I go for?

It depends on the diving you want to do — cave, cold water and travel all pull in different directions on material, seals and pockets. Tell us what you want to use it for and we will tell you honestly which suit fits that.

Does the suit itself keep me warm?

No — the undergarment does. The suit is a shell that keeps water out; the loft underneath is what holds the heat. Getting that layer right matters as much as the suit, and bulkier is not automatically warmer.

Fast delivery and convenient online shop

Modern technologies and materials

Comfortable to use anytime

Flexible return policy and warranty