Fourth Element X-Core Vest

The X-Core Vest is built around a simple diving reality: when the body gets cold, it protects the core first. By adding heavyweight insulation around the torso, the X-Core helps extend comfort during cold-water dives while keeping the shoulders and arms free for movement.

It is designed to be worn over a lightweight baselayer such as Xerotherm or J2, or beneath a drysuit undersuit such as the Arctic or HALO A°R. For many divers, this extra core warmth can reduce the need for electric heating in moderate cold-water conditions.

• Fourth Element X-Core Vest

Why Choose the Fourth Element X-Core Vest?

The Fourth Element X-Core Vest is designed for one specific purpose: increasing warmth where your body needs it most. During cold-water dives, the body naturally prioritises protecting the core, making torso insulation one of the most effective ways to improve overall comfort. The X-Core Vest delivers concentrated thermal protection without adding unnecessary bulk, making it an excellent addition to almost any drysuit layering system.

Unlike a full undersuit, the X-Core Vest focuses solely on protecting the chest, back and core muscles while leaving the shoulders and arms unrestricted. This allows divers to increase thermal performance without compromising mobility, buoyancy or comfort inside a drysuit.

Designed to Enhance Your Existing Thermal System

The X-Core Vest is not intended to replace a drysuit undersuit. Instead, it works alongside garments such as the Fourth Element Arctic X or HALO A°R to provide additional insulation where it delivers the greatest benefit. Worn over a lightweight baselayer like Xerotherm or J2, it creates a highly efficient layering system suitable for demanding cold-water dives.

For many divers, this targeted approach provides enough additional warmth to avoid the complexity and maintenance associated with electrically heated garments.

Maximum Warmth Without Restricting Movement

The sleeveless construction is one of the X-Core Vest's greatest strengths. By eliminating unnecessary insulation around the shoulders and upper arms, freedom of movement remains virtually unaffected while the body's core receives maximum thermal protection. Four-way stretch fabric, a slim fit and an extended body length ensure the vest remains comfortably positioned beneath your drysuit throughout the dive.

Fast-wicking Polartec® Power Stretch® fabric also helps move moisture away from the skin, improving comfort during longer dives and helping maintain thermal efficiency.

Ideal for Melbourne and Victorian Diving

Cold-water diving around Melbourne, Port Phillip Bay and the Mornington Peninsula often involves extended dive times where maintaining body temperature becomes increasingly important. The X-Core Vest provides an effective way to increase warmth without dramatically changing your existing equipment or buoyancy characteristics.

Whether you're shore diving, completing technical training or spending long periods underwater photographing marine life, the X-Core Vest offers an excellent balance of warmth, comfort and flexibility.

Complete Your Fourth Element Layering System

The X-Core Vest performs best as part of a complete thermal system. Pair it with a Fourth Element Xerotherm or J2 baselayer beneath, and an Arctic X or HALO A°R undersuit over the top, to create a highly efficient cold-water layering solution suitable for recreational, technical and CCR diving throughout Australia.