Speedo Women's HyperBoom Splice Muscleback Swimsuit in black, plum dandy, and siren red showing the sleek design and color details.

Speedo Women's HyperBoom Splice Muscleback Swimsuit in black, plum dandy, and siren red, designed for active swimming.

Speedo women's HyperBoom Splice muscleback swimsuit in black, plum dandy, and siren red, with sleek design and athletic fit.

Speedo Women's HyperBoom Splice Muscleback Swimsuit in black, plum dandy, and siren red, featuring a sleek design and athletic fit.

Speedo Womens HyperBoom Splice Muscleback Swimsuit - Black/Plum Dandy/Siren Red

Brand: Speedo

SKU: 8-1347017597-30

Availability: In stock

£12.29 GBP; ~~£35.11 GBP~~; £12.29 GBP
Unit price: per

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Size: 30 30 32 38 42

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Speedo Womens HyperBoom Splice Muscleback Swimsuit - Black/Plum Dandy/Siren Red

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Speedo · Swimsuits SPEEDO WOMENS HYPERBOOM SPLICE MUSCLEBACK SWIMSUIT Black/Plum Dandy/Siren Red Bold legacy prints meet durable Endurance+ fabric for a workout-ready muscleback. Make a statement in HyperBoom logo prints. Paying homage to Speedo’s legacy graphics, this sporty black muscleback features flattering shaped side panel splices of the evolutionary HyperBoom logo print in intense shades of fluro red and purple. The muscleback design and medium leg offer flexibility and freedom of movement, so you can rock your workout in comfort. Made from durable Endurance+ fabric, it’s quick-drying and chlorine-resistant, with polyester yarn made from 100% post-consumer waste such as recycled plastic bottles. Rock your workout in comfort.

Muscleback DesignEndurance+ Fabric100% Chlorine ResistantQuick-DryRecycled Materials

3 Key Features

HyperBoom Legacy Print

The HyperBoom splice design pays homage to Speedo’s iconic legacy graphics. Shaped side panel splices in intense fluro red and purple contrast sharply against the sporty black base. It’s a bold look that stands out in any pool lane.

Muscleback Freedom

The muscleback construction is cut specifically to maximise flexibility and freedom of movement during training. A medium leg height complements the fit, giving you a comfortable range of motion stroke after stroke. Whether you’re drilling technique or pushing distance, this suit moves with you.

Endurance+ Sustainability

Endurance+ fabric delivers 100% chlorine resistance for long-lasting performance session after session. It dries faster after your swim workout, keeping transitions quick. The polyester yarn is made from 100% post-consumer waste, such as recycled plastic bottles, so your training kit has a reduced environmental footprint.

Full Feature Breakdown

Muscleback DesignOffers flexibility and freedom of movement so you can swim in comfort throughout your workout.
100% Chlorine ResistanceEndurance+ fabric withstands repeated pool exposure without losing shape or colour.
Quick-DryThe fabric dries faster after your swim workout, reducing wait time between sessions.
Recycled Polyester YarnThe polyester yarn in this Endurance+ fabric is made from 100% post-consumer waste such as recycled plastic bottles.
HyperBoom Splice PanelsShaped side panel splices in fluro red and purple create a flattering silhouette alongside the sporty black base.
Medium Leg HeightProvides comfortable coverage and a secure fit during training without restricting movement.

Product Specifications at a Glance

Fabric: Endurance+, 53% Recycled Polyester / 47% PBTChlorine Resistance: 100%Back Style: MusclebackLeg Height: MediumColourway: Black / Plum Dandy / Siren RedSustainability: Polyester yarn made from 100% post-consumer recycled wasteBrand: SpeedoBest For: Regular pool training and fitness swimming

Not sure on sizing? See our Speedo Adult Female Swimwear 24-46 or ask our swimwear experts for advice.

Speedo Adult Female Swimwear 24-46

← Scroll to see all sizes →

Size	2/24	4/26	6/28	8/30	10/32	12/34	14/36	16/38	18/40	20/42	22/44	24/46
International Size Equivalents
UK Dress Size / Size	2/24	4/26	6/28	8/30	10/32	12/34	14/36	16/38	18/40	20/42	22/44	24/46
D (Germany)	28	30	32	34	36	38	40	42	44	46	48	50
F (France)	30	32	34	36	38	40	42	44	46	48	50	52
I (Italy)	34	36	38	40	42	44	46	48	50	52	54	56
Lat Am	24	26	28	30	32	34	36	38	40	42	44	46
Aus	0	2	4	6	8	10	12	14	16	18	20	22
USA	N/A	N/A	N/A	0/2	4	6	8	10	12	14	16	18
Body Measurements (cm)
Bust	64–66	66–71	71–76	76–81	81–86	86–91	91–96	96–101	101–106	106–111	111–116	116–121
Waist*	48–51	52	57	62	67	72	77	82	87	92	97	102
Hip	74–76	77	82	87	92	97	102	107	112	117	122	127
Body Measurements (inches)
Bust	25–26	26–28	28–30	30–32	32–34	34–36	36–38	38–40	40–42	42–44	44–46	46–48
Waist*	19	20	22	24	26	28	30	32	34	36	38	40
Hip	29	30	32	34	36	38	40	42	44	46	48	50

All measurements are body measurements, not garment measurements. For further guidance view our full size guide or ask our swimwear experts.

Frequently Asked Questions

QWhat is the difference between a muscleback and a regular swimsuit back?

A muscleback has a wider, more open back than a standard strapped suit, exposing more of the shoulder and upper back. This gives greater freedom of movement through the shoulders and arms, making it a popular choice for training swimmers who want comfort over a full session.

QHow do I find the right size in this suit?

Speedo sizing can vary from standard UK clothing sizes, so we recommend checking our Speedo Adult Female Swimwear 24-46 before ordering to find the best fit for your measurements.

QIs Endurance+ fabric genuinely more durable than standard swimwear fabric?

Yes. Endurance+ is Speedo’s workhorse training fabric, offering 100% chlorine resistance so it holds its shape, elasticity, and colour far longer than conventional swimwear fabrics when used in regular pool sessions.

QAre the recycled materials noticeable in the fit or feel of the suit?

Not at all. The recycled polyester yarn performs identically to virgin polyester within the Endurance+ construction. You get the same durable, quick-drying, chlorine-resistant finish while the fabric’s environmental credentials speak for themselves.

Care Instructions

💧Rinse immediately after every use in cool, non-chlorinated water
🚫Do not leave the wet suit in a bag for extended periods
☀️Leave to dry naturally avoiding sunlight
🧼Hand wash only with a detergent suitable for delicate fabrics
🌬️Air dry by hanging away from direct heat sources
🚫Do not machine wash, tumble dry, wring, iron or dry-clean

View our full swimwear product aftercare guide to ensure you look after your kit properly.

Why Buy from Allens Swimwear?

A Family Business Built on Swimming Since 1976

Allens Swimwear is a family-run business founded in 1976 by Dennis Allen and his daughter Linda Beal. It started from a genuine need. “With 2 swimmers in the family it was often difficult to find the right kit, so dad and I took the plunge and started selling to local swimmers at our local pool in Kingsbury out of a suitcase and we’ve never looked back.” Today, Linda, her husband Richard, and three of their children Danny, Will and Jenna still run the business together. The suitcase may be long gone, but the founding principle of helping swimmers get the right kit remains exactly the same.

🏆50 Years of Expertise50 years in the swimming world. Our swimwear experts are on hand by phone or in store to give you honest, expert advice on sizing, fit and product choice.

🏪Visit Us In StoreCome and see us at our Midlands store in Dordon, Tamworth. Mon to Fri 8am to 4pm, Sat 8am to 3pm, Sun 10am to 2pm. Please check our Visit Us page to confirm opening hours before making a special trip.

📦Free UK Delivery and No Hassle ReturnsFree delivery on orders over £40. If something is not right, we make returns straightforward and stress-free.

🪡Race Suit Repair ServiceSnagged or damaged your suit? Our professional race suit repair service can save your investment and get you back racing.

🏊Swimming Club PartnershipsWe work directly with swimming clubs across the UK. Find out about our Club Partnership Programme for exclusive club discounts and benefits.

💙10% Blue Light DiscountNHS, Emergency Services, Armed Forces and teachers all receive 10% off every order, in store or online, every time. No codes, no hoops.

Helpful Links from Allens Swimwear

🏪About Allens Swimwear 📏Speedo Adult Female Swimwear 24-46 📋Full Product Aftercare Guide 📦Delivery Information ↩️Returns Policy 📍Visit Us In Store ✉️Get In Touch 💙Blue Light Card Discount 🪡Race Suit Repair Service 🏊Swimming Club Partnership Programme

UK Delivery Options

🚚 Free UK Delivery

Free delivery on all orders over £40

For orders below £40, delivery charges will be displayed at checkout.

The total order value, including any deals or discounts (such as a discount code), must be over £40.

📮 Royal Mail

Tracked 24: Usually 1–2 working days.
Tracked 48: Usually 2–3 working days.
Guaranteed Next Day Delivery: Order before 3pm Monday–Friday or 8am Saturday. Orders placed after 8am Saturday will be delivered Tuesday.

📦 UPS

Standard: Usually 1–2 working days.

🚀 DHL Courier

Standard: Usually 1–2 working days.
Economical: Usually 3–4 working days.

🏪 In Store Collection

Free in store collection is available. Simply choose this option at checkout and pick up your order at our store.

🕐 Delivery Times

In stock items are usually dispatched the same day.
Delivery estimates are affected by seasonal demand and weather conditions.
Unless stated otherwise, please allow up to 30 days for delivery.

EU Delivery Options

✈️ FedEx

Priority: 1–2 working days across the EU.
Economy: 3–5 working days for EU destinations.
Standard: 1–4 working days within the EU.

International Delivery Options

🌍 International Shipping

Customs charges may apply based on your country's regulations.
Cross border shipments may be inspected by customs authorities.

📮 Royal Mail

International Tracked: Typically 10–15 working days for delivery.

🚀 DHL Courier

DHL Express: Delivery within 2–3 working days internationally.

Important Information

Delivery charges and options will be displayed at checkout, tailored to your location and preferences.
Please note that delivery times may vary due to seasonal demand or unforeseen circumstances.
For international deliveries, customs duties and taxes may apply based on your country's regulations.

FAQs

1. What delivery options do you offer?

We offer several delivery options, including Standard Delivery, Express Delivery, and International Shipping.

2. How long will it take for my order to arrive?

Delivery times depend on the option you choose at checkout. Standard Delivery typically takes 2–3 days, while Express Delivery is usually delivered within 1–2 days. International delivery times may vary by location.

3. How much does delivery cost?

Delivery costs vary based on the shipping method and destination. Standard delivery starts at £4.99, and express delivery starts at £14.99. International shipping rates are calculated at checkout.

4. Do you offer free delivery?

Yes, we offer free delivery on orders over £40. Terms and conditions apply.

5. Can I track my order?

Yes, once your order is dispatched, you'll receive a tracking number via email to monitor its progress.

6. Do you deliver internationally?

Yes, we deliver to many countries worldwide. Delivery times and costs for international orders are shown at checkout.

7. What should I do if my order hasn't arrived?

If your order hasn't arrived within the estimated timeframe, please contact us with your order number, and we'll assist you.

8. What happens if I'm not home to receive my delivery?

If you're not available, the courier will typically leave a card with instructions on how to rearrange delivery or collect your parcel.

9. Can I change my delivery address after placing an order?

We can make changes to your delivery address if your order hasn't been dispatched. Please contact us as soon as possible.

10. What if my order arrives damaged or incomplete?

If your order arrives damaged or is incomplete, please contact our customer service team as soon as possible with photos and your order number, and we'll resolve the issue promptly.

11. Do you deliver to PO Boxes or BFPO addresses?

Currently, we don't deliver to PO Boxes and BFPO addresses. Please check specific delivery options at checkout.

12. Can I choose a specific delivery date?

For express or special deliveries, you may be able to select a preferred delivery date at checkout.

Returns Policy

We offer a free returns service. We advise that customers keep either proof of posting or a receipt as we cannot be held accountable for items lost being returned to us.

Please note that this returns policy does not cover items such as special order swimwear, customised products and products ordered specifically at the request of a customer. Products such as these cannot be returned (unless faulty).

Free UK Returns

If you are unhappy with your purchase for any reason, then we will gladly refund you within 28 days of purchase. Simply click on the link below to begin the returns policy:

ALLENS OF KINGSBURY RETURNS

EU & International Returns

Returns outside of the UK are at the buyer's cost. Please return to us at the address below.

ALLENS OF KINGSBURY 80 Barden View Road
Dordon
Staffordshire
B78 1QB
England

Please ensure that you have completed a CN22 Customs declarations form and that this has been clearly marked as being Returned Goods. Please mark the return parcel on the outside clearly as returned goods. Failure to do this could result in Customs charges being applied to the parcel on its return. I regret we cannot accept parcels with customs duties and charges payable — these will be returned to sender.

Non-Faulty Goods

Please return items with the original packaging if possible and to keep hygiene seals on suits, please also include a copy of the invoice received clearly stating on this that you would like a refund for the return.

Please note that we will not accept non-faulty items back that have been worn or without their relevant packaging, labels or stickers.

If you would like to exchange an item for an alternative size, style or item please follow the link to us along with a copy of your invoice, please note on the invoice what item is required as an alternative.

Faulty Goods

In the case of faulty goods, please contact us and provide details of the nature of complaint along with photos and the date of purchase and the care given to product.

In all cases of complaint we will endeavour to substitute faulty goods with an identical replacement, or substitute the goods with ones of similar value. This does not affect your statutory rights, and you may of course choose to have a complete refund if you are not 100% happy.

How to Return an Item

Fill out the Returns Form included in your package.
Securely pack your items, ideally in the original packaging.
For UK customers, use this link.
For international customers, ensure shipping is prepaid and use an insured service.

Need Help?

If you have any questions about delivery, please contact us.

This size guide covers Speedo adult women's swimwear in numeric sizes 24–46 (equivalent to UK dress sizes 6–22). All measurements are body measurements taken from your own body, not garment measurements. Always use your bust measurement as the primary guide. International size equivalents (D, F, I, Lat Am, Aus, USA) can be expanded within the sizing table below.

Shop Speedo Women's Swimsuits →

Body Measurement Points

Speedo women's swimwear body measurement diagram

How to Measure

Take all measurements directly against your skin using a soft tape measure. All measurements are body measurements, not garment measurements.

A
BustMeasure around the fullest part of your chest, keeping the tape horizontal and snug but not tight.
B
WaistMeasure at the narrowest part of your natural waist.
C
HipMeasure around the fullest part of your hips and seat, keeping the tape horizontal.

*Waist is measured at the natural waist at narrowest point.

Sizing Table — Speedo Adult Female Swimwear (Sizes 24–46)

Sizing	2/24	4/26	6/28	8/30	10/32	12/34	14/36	16/38	18/40	20/42	22/44	24/46
International Size Equivalents
UK Dress Size / Size	2/24	4/26	6/28	8/30	10/32	12/34	14/36	16/38	18/40	20/42	22/44	24/46
D (Germany)	28	30	32	34	36	38	40	42	44	46	48	50
F (France)	30	32	34	36	38	40	42	44	46	48	50	52
I (Italy)	34	36	38	40	42	44	46	48	50	52	54	56
Lat Am	24	26	28	30	32	34	36	38	40	42	44	46
Aus	0	2	4	6	8	10	12	14	16	18	20	22
USA	—	—	—	0/2	4	6	8	10	12	14	16	18
Body Measurements (cm)
Bust	64–66	66–71	71–76	76–81	81–86	86–91	91–96	96–101	101–106	106–111	111–116	116–121
Waist*	48–51	52	57	62	67	72	77	82	87	92	97	102
Hip	74–76	77	82	87	92	97	102	107	112	117	122	127
Body Measurements (inches)
Bust	25–26	26–28	28–30	30–32	32–34	34–36	36–38	38–40	40–42	42–44	44–46	46–48
Waist*	19	20	22	24	26	28	30	32	34	36	38	40
Hip	29	30	32	34	36	38	40	42	44	46	48	50

*Waist is natural waist at narrowest point. All measurements are body measurements, not garment measurements.

Fit Notes

Always use your bust measurement as the primary guide when selecting a Speedo swimsuit size.
Speedo swimsuits are designed to fit closely and securely — they feel firmer than a regular fitted top, which ensures the suit stays in place during swimming.
If bust and hip measurements suggest different sizes, choose the size that fits your bust and check the hip falls within range.
Speedo swimsuits are made from chlorine-resistant fabrics that ease slightly with wear — do not size up based on initial tightness.
The swimsuit should feel secure across the bust and back with no gaping, pulling, or riding up.
Rinse in cold fresh water immediately after every use. Do not tumble dry, iron, or dry-clean.
Unsure? Contact our team or call +44 1827 330600.

Frequently Asked Questions — Speedo Women's Swimwear (24–46)

Measure your bust, waist, and hip against your skin with a soft tape measure. Use your bust as the primary guide and compare to the sizing table above. International size equivalents are in the collapsible section — always prioritise body measurements.

Size to your bust measurement. If your hips are significantly larger relative to your bust, try the next size up. Speak to a member of staff at Allens if you are unsure.

Yes — chlorine-resistant Speedo fabrics feel firm when new and ease slightly with regular use. Do not size up based on how the suit feels when you first try it on.

Speedo swimsuits are primarily designed for pool use. While the chlorine-resistant fabrics will withstand occasional use in open water or the sea, prolonged exposure to salt water can accelerate fabric degradation. Rinse the suit thoroughly in fresh water after every use. For dedicated open water or triathlon use, a wetsuit or open water-specific suit is recommended.

Rinse your Speedo swimsuit in cold fresh water immediately after every use to remove chlorine, salt, and sunscreen. Hand wash gently with a mild detergent if needed. Do not machine wash, tumble dry, iron, or dry-clean. Store flat and dry, away from direct sunlight.

Speedo swimsuit sizes do not directly correspond to standard clothing sizes. Always use body measurements to select the correct size. International size equivalents are shown as a secondary reference only — always prioritise body measurements.

Standard Speedo swimsuits are suitable for recreational and fitness swimming. For competitive pool swimming, Speedo's Fastskin racing range is specifically designed and World Aquatics approved. Speak to a member of staff at Allens for guidance on the right product for your level.

Speedo Womens HyperBoom Splice Muscleback Swimsuit - Black/Plum Dandy/Siren Red

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