Fourth Element Arctic X Women's One Piece
Use these size guides to find the best fitting size for your Fourth Element Undersuit garments for you. Please be aware that not all sizes are available in all products. See individual product pages for size availability. Please contact us if you have any questions or require further assistance with sizing.
Please note that not all sizes are available in every garment.
Please note: Fourth Element sizes are designed to be snug. For a more comfortable fit, we recommend considering a size up than your usual dress size.
Find below Men's, Women's and Sock Size Charts:
Mens's Sizes
| Size | Height (cm / in) | Chest (cm / in) | Waist (cm / in) | Inside Leg (cm / in) |
|---|---|---|---|---|
| X Small | 165–172.5 / 65–68 | 76–86 / 30–34.2 | 58–68 / 23–27 | 76–80 / 30–31.5 |
| Small | 170–178 / 67–70 | 86–96 / 34–38.2 | 68–78 / 27–30.5 | 79–83 / 31–32.5 |
| Medium | 175.5–183 / 69–72 | 96–106 / 38–42.2 | 78–88 / 30.5–34.5 | 82–86 / 32.5–34 |
| Large | 180.5–188 / 71–74 | 106–116 / 41.5–46.2 | 88–98 / 34.5–38.5 | 85–89 / 33.5–35 |
| X Large | 185.5–193 / 73–76 | 116–126 / 45.5–50.2 | 98–108 / 38.5–42.5 | 88–92 / 34.5–36 |
| XX Large | 190.5–198 / 75–78 | 126–136 / 49.5–54.2 | 108–118 / 42.5–46.5 | 91–95 / 36–37.5 |
| XXX Large | 195.5–203 / 77–80 | 136–146 / 53.5–58.2 | 118–128 / 46.5–50.5 | 94–98 / 37–38.5 |
Women's Sizes
| Size | Height (cm / in) | Chest (cm / in) | Waist (cm / in) | Inside Leg (cm / in) |
|---|---|---|---|---|
| XX Small | 160–168 / 63–66 | 68–76 / 27–30 | 51–59 / 20–23 | 71–75 / 28–29.5 |
| X Small | 162.5–170 / 64–67 | 74–82 / 29–33 | 57–65 / 22.5–25.5 | 73–77 / 28.5–30.5 |
| Small | 165–173 / 65–68 | 80–88 / 31.5–35 | 63–71 / 25–28 | 75–79 / 29.5–31 |
| Medium | 167.5–175 / 66–69 | 86–94 / 34–37 | 69–77 / 27–30.5 | 77–81 / 30.5–32 |
| Large | 170–178 / 67–70 | 92–100 / 36–40 | 75–83 / 29.5–32.5 | 79–83 / 31–32.5 |
| X Large | 172.5–180 / 68–71 | 98–106 / 38.5–42 | 81–89 / 32–35 | 81–85 / 32–33.5 |
| XX Large | 172.5–180 / 68–71 | 104–112 / 41–44 | 87–95 / 34.5–37.5 | 81–85 / 32–33.5 |
Sock Sizes
| Unisex Sizes | UK | US | EU |
|---|---|---|---|
| XS | 3-4 | 4-5 | 35-37 |
| S | 5-6 | 6-7 | 38-40 |
| M | 7-8 | 8-9 | 41-42 |
| L | 9-10 | 10-11 | 43-44.5 |
| XL | 11-12 | 12-13 | 46-47 |
| XXL | 13-4 | 14 - 15 | 48-49 |
One garment, complete coverage, zero cold spots. The Fourth Element Arctic X Women's One Piece is a purpose-built drysuit undersuit cut specifically for the female form — and if you've ever dived in a unisex one piece that gaps at the waist or pulls across the shoulders, you'll immediately appreciate the difference. This is cold-water diving kit designed by divers who actually thought about how women's bodies move underwater.
The DWR water-repellent outer shell sheds moisture between dives while the soft fleece lining locks in warmth throughout. Articulated sleeves and knees combined with 4-way stretch fabric give you the freedom of movement that matters most when you're working in horizontal trim — no tugging, no restriction, just a suit that moves with you. The full-length two-way zip makes getting in and out straightforward even when you're already half-frozen on a dive boat, and the suit is pee-valve ready for those longer dives when you'd rather not think about the alternative.
Thumb loops and single-layer foot stirrups keep everything neat and in place while you're pulling on your drysuit, and the low-bulk ankle design means no bunching around your boots. Pockets handle the small essentials, and subtle reflective prints add low-light visibility when conditions call for it. Made from recycled materials certified to Global Recycled Standard (GRS), Oeko-Tex 100 and Bluesign standards, supplied in plastic-free packaging, and machine washable. Available in regular and short leg lengths — because fit really does matter.
Key Features
- Full one-piece construction — eliminates cold spots and gaps between separate top and bottom layers
- Women's-specific cut for a close, comfortable fit in and out of the water
- Exceptional thermal protection with minimal bulk — purpose-built as a drysuit undersuit
- Full-length two-way zip for easy donning and doffing
- Pee-valve ready
- DWR water-repellent outer layer to shed moisture between dives
- Soft fleece lining for warmth without added weight
- 4-way stretch fabric for unrestricted movement in any position
- Articulated sleeves and knees optimised for horizontal trim
- Thumb loops to keep cuffs in place while donning
- Single-layer foot stirrups — slim ankle profile fits easily under a drysuit
- Integrated storage pockets
- Subtle reflective prints for low-light visibility
- Made from recycled materials — GRS, Oeko-Tex 100 and Bluesign certified fabrics
- Plastic-free packaging
- Machine washable
Technical Specifications
| Colour | Black |
| Weight | 1.30 kg |
| Outer Shell | 85% nylon, 15% elastane |
| Inner Shell | 95% polyester, 5% elastane |
| Lining | 81% recycled polyester, 12% elastane, 7% polyester |
| Certifications | Global Recycled Standard (GRS), Oeko-Tex 100, Bluesign |
| Packaging | Plastic-free |
| Care | Machine washable |
FAQ
One piece or separate jacket and leggings — which is better?
It comes down to how you dive and what you want from your undersuit system. A one piece gives you seamless, gap-free coverage from neck to ankle — ideal for colder water or longer dives where any weak point in your thermal layering will eventually make itself known. Separates offer more flexibility if you run warmer in some areas than others, or if you want to adjust your layering between dives. Both approaches work well — if you're unsure, our video consultation team can help you work out which suits your diving best.
Is the Arctic X Women's One Piece suitable as a standalone undersuit?
Yes. It's designed to work as a complete drysuit undersuit on its own in moderately cold to cold water. For very cold or technical dives, some divers add a thermal base layer underneath for extra insulation.
What does pee-valve ready mean — does it come with one fitted?
Pee-valve ready means the suit is designed and constructed to accept a pee valve (p-valve), but one is not included or fitted as standard. Fitting is typically carried out by a drysuit technician. It's worth sorting before a trip if you're planning longer dives or diving in very cold water — you'll thank yourself later.
Will it fit under my drysuit without adding too much bulk?
Yes — the low-bulk construction and single-layer foot stirrups are specifically designed to keep the profile slim, particularly around the ankles where extra volume tends to cause problems with drysuit boots. The 4-way stretch fabric also helps everything sit smoothly without bunching.
How do I care for the Arctic X One Piece?
Machine washable — follow the care label instructions. Avoid fabric softener as it can break down the DWR water-repellent coating over time. If water repellency reduces after extended use, a DWR re-treatment spray will restore performance.
VIDEO CONSULTATIONS NOW AVAILABLE: We're bringing our highly experienced and knowledgeable staff to you with live-streaming consultations. If you need help choosing the right bit of kit or the best size before buying or even advice on whether a purchased item is the right fit for you, then book yourself a consultation appointment.
We offer free tracked UK standard delivery on orders over £50 (Excluding Weights and Cylinders, as they must go on a separate service to your order)
Standard UK delivery and Next Business Day UK delivery rates are calculated at checkout and offers a number of courier options for maximum convenience to you.
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Estimated delivery times are shown during checkout and reflect your chosen delivery method. More Details
60 Day Stress Free Returns
If you change your mind, it doesn’t fit, or you become inflicted with buyer’s regret - that's OK!
Mike's Dive Store offer an extended returns policy of 60 days - so you can be rest assured if the suit, piece of diving equipment or gift doesn't suit then just send it back, and we will either exchange it or offer a full refund less any postage costs. Too easy!
Please note that there are some special order items on our website that will be subject to a 20% re-stocking fee, but we will let you know about these items before we 'special order' them so that you are aware of this. If this is the case we can always help with correct sizing so that we minimise the risk of return. More Details
Returning To Chiswick Store
We want to make your shopping experience as seamless and enjoyable as possible, even when it comes to returns. That’s why we offer hassle-free returns at our Chiswick store. But there’s more—when you visit to make a return, you can also pre-order items to be available for collection. This means we’ll have a range of sizes ready for you to try on, ensuring you find the perfect fit before leaving the store.
Shop with Confidence, Wherever You Are
To make things even easier, we offer complimentary video consultations with our expert team. Whether it’s before or after your purchase, our specialists can guide you through sizing, fit, and styling—all from the comfort of your home. It’s like having your own personal VIP shopping experience, tailored just for you.
From returns to reorders, we’re here to help you find exactly what you need with zero stress.
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We offer the option for customers to choose ‘Pickup in store’ as a shipment method, allowing your order to be picked up from our Chiswick store at a time and date that works for you (within our business hours). The process is really easy, but we'll run through it here:
Step 1 - Add products to your cart:
Browse our vast selection of diving and snorkelling equipment, adding the kit you want to your cart.
Step 2 - Head to your cart:
Click on the cart icon to see a summary of the items you are about to purchase.
Step 3 – Review Your Order and Proceed to Checkout:
Once you're satisfied with the items in your cart, you can add a note to your order under the "Order Summary" section if desired. When you're ready to proceed, simply click "Checkout" to complete your order.
Step 4 - Customer Information:
If you have a Mike's Dive Store account, simply log in to autofill your details. If not, enter your email address, select ‘Pickup in Store,’ and then click ‘Continue to Payment’ to proceed.
Step 5 – Payment & Billing Details:
Select your preferred payment method and enter your payment information. Below, provide your billing details. If you're logged into your account, please double-check that your billing and contact information are up to date.
Step 6 – Review Order:
After entering your payment details, click ‘Review Order’ to proceed with placing your order. You will receive an email confirmation with your unique order number. We will notify you when your order is ready for collection, usually within 4 hours or sooner during our opening hours (Monday to Saturday, 10 AM to 6 PM). Please note that our hours may vary during the Christmas and New Year periods.
Our London Store Information:
Address:
Mike's Dive Store, 113 Power Rd, Chiswick, West London, W4 5PY
Telephone:
Local: 01202 037162
International: 0044 1202 037162
Email:
All Enquiries - support@mikesdivestore.com
Store Opening Times:
Mon - Fri: 10am - 6pm
Sat: 10am - 5pm
Sun: Closed
Need Help?
Our expert diving team is here to assist with your order, sizing, or product selection. We're divers ourselves, ready to support you!
Chat Hours:
Monday - Friday: 09:00 AM - 05:50 PM GMT
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Store Location
Mike's Dive Store
113 Power Rd, Chiswick, West London, W4 5PY
Store Hours
Mon - Fri: 10 AM - 6 PM
Sat: 10 AM - 5 PM
Sun: Closed
Bank Holidays: Store & Warehouse Closed (no dispatch)
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For more answers, visit our FAQs.