The Fourth Element X-Core Vest - Men's is Fourth Element's answer for someone looking for more warmth or considering an electrically heated product.

Weight for weight, X-Core Vest is Fourth Element's warmest undergarment ever. The minimalist vest provides extreme thermal protection to the core, enabling longer, safer, and more comfortable dives.

It is designed to be worn under a Fourth Element Arctic or any other drysuit undergarment, so it is a product for every diver looking to extend their season.

No batteries. Just you.

X-Core Vest is Fourth Element's answer for someone looking for more warmth or considering an electrically heated product. Emerging research from DAN and other sources is beginning to show that there may be many more physiological problems with active heating systems, so Fourth Element has developed a product designed to maximise body heat retention.

The body has an approximate power of 100W (similar to a bright, incandescent light bulb - remember those and how hot they were?). Most of this energy generated is dissipated as heat.

Fourth Element X-Core Vest aims to trap some of this heat in the dense fibres of the fabric, insulating the body core and maximising comfort.

X-Core Vest is designed for diving

The Fourth Element X-Core Vest is perfect next to skin or over a baselayer like the Fourth Element Xerotherm or J2. All-way stretch fabric gives a snug fit on the torso, but the sleeveless design prevents bulk around the arms and allows complete freedom of movement for valve shutdowns etc. The long body portion provides excellent coverage and prevents the vest from riding up.

The X-Core Vest is made from 76% recycled post-consumer plastic waste, yet its performance is not compromised in any way. The fabric is BlueSign® certified (meaning that the manufacturing process meets the highest sustainability standards), and the dyes used are certified by Oeko-Tex®) as not containing harmful substances.

Fourth Element X-Core Vest specifications

• Exceptional warmth 


• Perfect next to skin or over a baselayer


• All-way stretch fabric for a snug fit 


• Sleeveless design - complete freedom of movement for valve shutdowns
• Heavyweight Polartec® power stretch fabric


• BlueSign® and Oeko-Tex® certified


• 76% recycled polyester from post-consumer waste


• Machine washable