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Fourth Element

X-Core Womens Base Layer

Regular price £99.50 £99.50 Sale

Rated 5.0 out of 5
1 Review

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Fourth Element X-Core Womens Base Layer
Fourth Element X-Core Womens Base Layer Fourth Element X-Core Womens Base Layer

Fourth Element
X-Core Womens Base Layer

Regular price £99.50 £99.50 Sale

Rated 5.0 out of 5
1 Review

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Fourth Element

X-Core Womens Base Layer

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Fourth Element

X-Core Womens Base Layer

Regular price £99.50 £99.50 Sale In Stock

Brand: Fourth Element

Model: X-Core Womens Base Layer

SKU: 70567-2

The Fourth Element Women'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.

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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 1 review
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1 Review
Rated 5 out of 5
Review posted

Warm and Comfortable

Tried the vest on last week at Stoney Cove and the core did not feel cold after 45 minutes of swimming about in 7C. Material is very stretchy and warm. Added more lead in case it is buoyant and was over weighted. A much cheaper option than battery operated heated vests.

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