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Fourth Element

X-Core Mens Base Layer

Regular price £99.50 £99.50 Sale

Rated 5.0 out of 5
2 Reviews

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Fourth Element X-Core Mens Base Layer
Fourth Element X-Core Mens Base Layer Fourth Element X-Core Mens Base Layer

Fourth Element
X-Core Mens Base Layer

Regular price £99.50 £99.50 Sale

Rated 5.0 out of 5
2 Reviews

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Fourth Element

X-Core Mens Base Layer

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Fourth Element

X-Core Mens Base Layer

Regular price £99.50 £99.50 Sale In Stock

Brand: Fourth Element

Model: X-Core Mens Base Layer

SKU: 70568-2

The Fourth Element X-Core Men's Base Layer is a vest that, weight for weight, is the warmest undergarment Fourth Element have made to keep your core warm on colder or longer dives.  Keeping key organs in your core warm will keep the rest of your body warmer for longer without adding bulk or the need for electric heating coils.

No Batteries Needed

The X-Core is made to compliment and augment your existing undersuit without the need for heating elements or batteries, only your body heat and clever materials.  While some research suggests there may be adverse effects to your decompression with active heating systems the X-Core simply uses your body heat but holds onto it and reflects it back to you better than other fabrics.

Base Layer

The X-Core was made to be a baselayer, worn under an undersuit against your skin so it is soft and efficient at wicking moisture away from you.  All-way stretch fabric gives you a snug fit and moves with you without restricting your movement in any way thanks to the sleeveless design.  The vest is long too to cover most of your waist too for total coverage and no exposed parts when stretching.


  • Exceptional warmth
  • Perfect next to skin or over a baselayer
  • All way stretch fabric for snug fit
  • Sleeveless design - complete freedom of movement for valve shutdowns     
  • Heavy weight Polartec® power stretch fabric
  • BlueSign® and Oeko-Tex® certified
  • 76% recycled Polyester from post-consumer waste
  • Machine washable


X-CORE is the next stage of the development of Fourth Element's OceanPositive concept to include more than just swimwear and rash guards.  To be truly OceanPositive, they have begun a journey of re-envisioning their company and products.  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 any harmful substances.

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We offer free standard delivery on orders over £50.

Standard delivery is £3.70 for orders under £50. You will receive your order 2 - 4 days from the date of despatch.

Next Working Day is £6.95.

For Christmas delivery information, click here Learn more about delivery

We hope you will be completely satisfied with any product purchased from Simply Scuba.

However, you can return it for any reason within 28 days from the date of despatch for a full refund (less postage costs).

For Christmas returns information, click here Learn more about returns
average rating 5.0 out of 5
Based on 2 reviews
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100% of reviewers would recommend this product to a friend
2 Reviews
Rated 5 out of 5
Review posted

Very warm

Toss up between this and a thermalution glad I got this as it does the job on cold dives. Very comfortable very pleases

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Rated 5 out of 5
Review posted


Seems expensive for recycled plastic, but then I suppose recycling does cost more. That aside it's proved comfortable and really warm, especially when combined with my Xerotherm leggins and top. As it only covers the chest and abdomen arm movement is not restricted. One of the underarm seams is a little scratchy but not a problem if worn over my base-layer. Good product.

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