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Fourth Element

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Fourth Element J2 Base Layer Long Sleeve Top

Fourth Element J2 Base Layer Long Sleeve Top

RRP $199.00 AUD

Our Price $169.00 AUD

You Save $30.00 AUD (15%)

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Product overview

About this product

The Fourth Element J2 Long Sleeve Top is a premium drysuit baselayer designed to keep divers dry, comfortable and thermally efficient during extended dives. Constructed from OceanPositive recycled fabric with embedded anti-microbial silver ion technology, it rapidly wicks perspiration away from the skin to help maintain warmth beneath your drysuit.

Perfect for recreational, technical and sidemount diving throughout Melbourne, Victoria and other cold-water environments across Australia, the J2 Long Sleeve Top provides the ideal foundation for any drysuit layering system. Lightweight, breathable and fast drying, it pairs perfectly with the J2 Leggings and any Fourth Element thermal undersuit.

The Fourth Element J2 Base Layer Long Sleeve Top is a premium next-to-skin baselayer designed for extended drysuit diving. Made from OceanPositive recycled fabric with embedded anti-microbial silver ion technology, it rapidly wicks moisture away from the skin to keep divers dry, comfortable and thermally protected throughout long dives.

Lightweight, fast drying and exceptionally comfortable, the J2 Long Sleeve Top features four-way stretch fabric and a close-fitting design that layers perfectly beneath any drysuit undersuit, including the Fourth Element Arctic X, HALO A°R and X-Core Vest.

Available in men's and women's sizing. Most sizes are available to order with Australia-wide shipping.

Service and support

Shipping and specialist support

Why buy from Extreme Watersport

  • Silver Ion Technology
  • OceanPositive Fabric
  • Built for Extended Diving

Shipping

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.

Lead time

Usually dispatched within 1-5 business days.

Technical construction

Designed for Extended Drysuit Diving

The J2 Base Layer Long Sleeve Top is built for divers who spend long periods in their drysuit. Its OceanPositive recycled fabric rapidly transports perspiration away from the skin, helping maintain a dry microclimate that improves comfort and thermal performance throughout the dive.

Unlike ordinary baselayers, the J2 incorporates embedded anti-microbial silver ion technology that remains active within the fibres, reducing odour and improving comfort during repetitive dives, liveaboards and expeditions. The lightweight four-way stretch fabric fits closely beneath any drysuit undersuit without adding unnecessary bulk.

Performance detail

Performance highlights

Highlight

OceanPositive® Fabric

Constructed from GRS-certified recycled polyester, delivering premium performance with a reduced environmental impact.

Highlight

Silver Ion Protection

Embedded anti-microbial silver ion technology helps keep the garment fresh during extended, repetitive and expedition diving.

Highlight

Fast Moisture Wicking

Quickly moves perspiration away from the skin to help maintain a dry microclimate and improve thermal comfort throughout the dive.

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Built for Extended Dives

Lightweight, compact and fast drying, making it ideal for liveaboards, expedition diving and multi-day dive trips.

Specifications

Technical Specifications

Product
Fourth Element J2 Base Layer Long Sleeve Top
Layer Type
Premium next-to-skin drysuit baselayer
Best Use
Extended drysuit diving, expedition diving and thermal layering systems
Material
90% Recycled Polyester / 10% Elastane
Fabric Technology
OceanPositive® recycled fabric with embedded anti-microbial silver ion technology
Fit
Slim fit with four-way stretch for next-to-skin comfort
Key Features
Fast wicking, four-way stretch, lightweight construction and fast drying performance
Thermal Performance
High-performance moisture management for prolonged cold-water diving
Care Instructions
Machine wash cold. Line dry. Do not bleach, iron or tumble dry. Avoid fabric softeners. Dry clean if required.
Available Sizes
Men's and Women's standard sizes

The Fourth Element J2 Base Layer Long Sleeve Top is a premium next-to-skin baselayer designed for prolonged drysuit diving. Made from OceanPositive recycled fabric with embedded anti-microbial silver ion technology, it delivers rapid moisture management, lightweight comfort and long-lasting freshness for recreational, technical and expedition diving.

Fit guidance

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 size chart
Women's size guide
Fourth Element Women's Size chart

Included

What's Included

  • Fourth Element J2 Base Layer Long Sleeve Top

Product guidance

Product guidance

Why Choose the Fourth Element J2 Long Sleeve Top?

The Fourth Element J2 Long Sleeve Top is designed to form the essential first layer of any drysuit thermal system. Rather than simply adding warmth, it actively manages moisture by moving perspiration away from your skin, helping maintain the insulating air layer that keeps you warm throughout the dive.

Made from OceanPositive recycled fabric with embedded silver ion technology, the J2 remains comfortable during repetitive training, multi-day dive trips and extended technical dives. Its lightweight construction also reduces bulk beneath your thermal undersuit, improving overall comfort and mobility.

Perfect for Melbourne and Australian Cold-Water Diving

Whether you're shore diving around Port Phillip Bay, exploring Victoria's iconic wrecks or diving throughout Tasmania and southern Australia, effective moisture management is essential for staying warm underwater. The J2 Long Sleeve Top is designed specifically for drysuit diving, helping your thermal undersuit perform more efficiently throughout the dive.

It is equally suited to recreational diving, technical diving, sidemount diving, instructor work and multi-day dive expeditions where comfort and thermal consistency are important.

Why Wear a Baselayer Under a Drysuit?

A dedicated drysuit baselayer is designed to keep moisture away from your skin, allowing your thermal undersuit to trap insulating air more effectively. Unlike ordinary sports clothing, the Fourth Element J2 system is purpose-built for diving, combining rapid moisture transport with long-lasting anti-microbial protection for improved comfort during extended dives.

Build Your Complete Fourth Element Layering System

The J2 Long Sleeve Top is designed to be worn with the J2 Base Layer Leggings as a complete moisture management system. For additional insulation in colder water, pair it with the Fourth Element Xerotherm, Arctic X or Halo A°R undersuits to create a modular layering system suitable for changing diving conditions throughout the year.

Why Buy from Extreme Watersport?

Extreme Watersport is an authorised Fourth Element dealer in Australia, providing genuine products together with expert advice from experienced cold-water divers. Whether you're building your first drysuit layering system or upgrading your existing equipment, we can help you choose the right combination of baselayers and thermal undersuits for Melbourne, Victoria and Australian diving conditions.

Product help

Product FAQs

What is the J2 Base Layer designed for?

The J2 Base Layer is designed as a next-to-skin baselayer for drysuit diving. It rapidly wicks moisture away from the skin, helping keep divers dry, comfortable and thermally protected during long or repetitive dives.

What's the difference between the J2 and Xerotherm?

Both are premium drysuit baselayers, but they focus on different strengths. The J2 prioritises long-term comfort, moisture management and embedded anti-microbial silver ion technology for repetitive and expedition diving, while the Xerotherm focuses on maximising thermal insulation using Polartec® Power Stretch® fabric.

Can I wear the J2 beneath an Arctic X or HALO A°R undersuit?

Yes. The J2 is designed to be worn beneath premium drysuit undersuits such as the Fourth Element Arctic X and HALO A°R. It forms the foundation of an effective cold-water layering system by helping keep the skin dry throughout the dive.

Does the J2 still work if my drysuit leaks?

Yes. One of the key advantages of the J2 fabric is its exceptional moisture-wicking performance. Even if your drysuit experiences a minor leak, the fabric continues moving moisture away from the skin, helping improve comfort until the dive is complete.

Is the J2 suitable for liveaboards and expedition diving?

Absolutely. The J2 was developed specifically for prolonged and repetitive diving. Embedded anti-microbial silver ion technology helps maintain freshness during multiple dives over several days, making it an excellent choice for instructors, technical divers and liveaboard trips.

Is the J2 Base Layer machine washable?

Yes. Machine wash cold and line dry. Avoid bleach, fabric softeners, ironing and tumble drying to maintain the performance of the technical fabrics.

Need Help Choosing the Right Baselayer?

Choosing the right baselayer depends on your drysuit, water temperature and the type of diving you do. If you're unsure whether the J2 or Xerotherm is the better choice, or you'd like advice on building a complete layering system with Arctic X, X-Core or HALO A°R, our team is happy to help.

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