Fourth Element

Fourth Element Xerotherm Long Sleeve Top

The Fourth Element Xerotherm Long Sleeve Top is a premium Polartec® drysuit baselayer designed to deliver exceptional warmth, moisture management and all-day comfort beneath a drysuit. Made from genuine Polartec® Power Stretch®, it rapidly moves perspiration away from the skin while trapping a thin insulating layer of air to improve thermal performance without adding unnecessary bulk.

Ideal for recreational, technical and CCR diving throughout Melbourne, Victoria and other cold-water environments across Australia, the Xerotherm Top forms the perfect foundation for any drysuit layering system. Wear it on its own beneath neoprene drysuits or combine it with the Xerotherm Leggings, Arctic X or HALO A°R for additional insulation during colder dives.

Polartec® Power Stretch® Perfect Baselayer Trusted Worldwide
Fourth Element Xerotherm Long Sleeve Top

Choose Your Size

RRP
AUD $250
Our Price
AUD $215
You Save
AUD $35 (14%)
Most sizes are available to order. If your selected size is temporarily unavailable from Fourth Element, we'll confirm the latest delivery estimate before processing your order. Australia-wide shipping available.
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Product Highlights

The Foundation of an Effective Thermal Layering System

The Xerotherm Long Sleeve Top forms the essential first layer of your drysuit thermal system. Unlike traditional thermal garments that rely purely on thickness, Xerotherm focuses on moisture management, breathability and maintaining a thin layer of insulating air against the skin. The result is a baselayer that keeps you noticeably drier throughout long dives while adding minimal bulk or buoyancy.

Its lightweight construction makes it equally suitable beneath technical undersuits such as the Fourth Element Arctic or HALO A°R, or worn on its own beneath a neoprene drysuit in milder conditions.

Key Features

Key Features

Polartec® Performance Fabric

Constructed from genuine Polartec® Power Stretch® fabric for outstanding moisture management, comfort and durability.

Fast Moisture Wicking

Draws perspiration away from the skin to maintain a dry insulating air layer, helping improve warmth throughout the dive.

Low Bulk Layering

Slim-fitting design adds warmth without unnecessary bulk, making it ideal beneath another undersuit or under a neoprene drysuit.

Built for Drysuit Diving

Flatlock seams, an extended body length and thumb loops help keep the garment correctly positioned while donning your drysuit.

Technical Details

Technical Specifications

The Fourth Element Xerotherm Long Sleeve Top is engineered as a high-performance baselayer for drysuit diving. Its Polartec® Power Stretch® fabric provides exceptional moisture management, low bulk insulation and excellent freedom of movement, making it suitable for recreational, technical and professional cold-water diving.

Product
Fourth Element Xerotherm Long Sleeve Top
Layer Type
Next-to-skin thermal baselayer
Best Use
Drysuit diving and cold-water layering systems
Material
57% Polyester / 33% Nylon / 10% Elastane (Polartec® Power Stretch®)
Fit
Slim fit designed to sit close to the skin
Thermal Performance
Lightweight insulation with outstanding moisture management
Key Features
Flatlock seams, extended body length and integrated thumb loops
Care
Machine wash cold. Line dry. Do not tumble dry.
Ideal Pairing
Fourth Element Arctic, HALO A°R and other drysuit undersuits
Available Sizes
Men's and Women's standard sizes
Included

What's Included

  • Fourth Element Xerotherm Long Sleeve Top
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

Fourth Element Xerotherm Long Sleeve Top men’s size guide

Women’s Size Guide

Fourth Element Xerotherm Long Sleeve Top women’s size guide

Why Choose the Fourth Element Xerotherm Top?

The Fourth Element Xerotherm Top is designed to provide the ideal balance of thermal insulation, moisture management and comfort beneath a drysuit. Made from genuine Polartec® Power Stretch®, it helps trap a thin insulating layer of air while rapidly transporting perspiration away from your skin, improving warmth throughout every stage of the dive.

Its close-fitting, low-bulk design makes it suitable for recreational diving, technical diving, sidemount diving and CCR diving where unrestricted upper-body movement and efficient layering are essential.

Perfect for Melbourne and Australian Cold-Water Diving

Whether you're diving the piers of Port Phillip Bay, exploring Victoria's wrecks or travelling to Tasmania for colder conditions, the Xerotherm Top provides dependable thermal performance without unnecessary bulk. It performs equally well during recreational shore dives, instructor work and extended technical dives where maintaining core warmth is essential.

Xerotherm vs J2: Which Baselayer Is Right for You?

The J2 Base Layer is designed primarily to maximise moisture management directly against the skin. The Xerotherm Top builds on this by adding genuine thermal insulation through Polartec® Power Stretch®, making it the ideal choice for divers seeking additional warmth while retaining a lightweight layering system.

Build Your Complete Fourth Element Layering System

Pair the Xerotherm Top with the Xerotherm Leggings for full-body thermal performance, or layer it beneath the Arctic X or HALO A°R undersuits when diving in colder water. This modular approach allows you to tailor your thermal protection to different dive conditions throughout the year.

Why Buy from Extreme Watersport?

As an authorised Fourth Element dealer in Australia, Extreme Watersport supplies genuine Fourth Element thermal systems backed by expert advice from experienced cold-water divers. Whether you're comparing the Xerotherm with the J2, Arctic X or HALO A°R, we'll help you build the right layering system for your drysuit, local conditions and diving goals.

FAQ

Fourth Element Xerotherm Long Sleeve Top FAQ

Can the Xerotherm Long Sleeve Top be worn on its own?

Yes. The Xerotherm can be worn on its own beneath a neoprene drysuit or as a lightweight thermal layer in milder conditions. For colder water or longer dives, it is designed to be paired with another undersuit such as the Fourth Element Arctic or HALO A°R.

Is the Xerotherm suitable for trilaminate drysuits?

Absolutely. The Xerotherm is designed as a next-to-skin baselayer for trilaminate drysuits, helping to move moisture away from the body while improving the performance of your outer thermal undersuit.

What makes the Xerotherm different from ordinary thermal clothing?

The Xerotherm uses genuine Polartec® Power Stretch® fabric, engineered to move moisture away from the skin while trapping a thin insulating layer of air. This provides better comfort and thermal performance than ordinary thermal clothing designed for everyday use.

Can I wear the Xerotherm with another undersuit?

Yes. The Xerotherm was specifically developed as a baselayer and pairs exceptionally well with undersuits such as the Fourth Element Arctic and HALO A°R, providing improved moisture management and overall warmth.

How should the Xerotherm fit?

The Xerotherm is designed with a slim fit so it sits close to the skin. This allows it to wick moisture efficiently without restricting movement under your drysuit.

Is the Xerotherm machine washable?

Yes. The Xerotherm can be machine washed using a cold wash cycle. Line dry after washing and avoid tumble drying to maximise the life of the fabric.

Need Help?

Need Help Choosing the Right Baselayer?

The right baselayer plays a major role in keeping you comfortable throughout a dive. If you're unsure whether the Xerotherm is the right choice, or you'd like advice on pairing it with an Arctic or HALO A°R undersuit, we're happy to help you build the best layering system for your diving.

Contact Us for Advice