Best UV Swimwear and Sun Protection Clothing in the UK (2026 Guide)

The best UV swimwear in the UK is rated UPF 50+, tested in a lab, and designed to cover as much skin as possible. That is the position of the British Association of Dermatologists, the Skin Cancer Foundation, and every major skin cancer charity in the country. Several brands now sell UPF-rated clothing to UK buyers, including equatorsun, Muddy Puddles, Frugi, Coolibar, and Solbari, but they differ widely in who they cater for, what they test to, and how much of the body their garments actually cover.

This guide breaks down what UPF means, why it matters in the UK specifically, how the main brands compare, and what to look for before buying.

The Skin Cancer Problem in the UK

Melanoma, the most deadly form of skin cancer, is the fifth most common cancer in the United Kingdom. Cancer Research UK puts the number of new cases at roughly 17,600 each year, with projections reaching 20,800. Incidence has climbed by about 147% since the early 1990s. Around 2,600 people in the UK die from melanoma annually. That is more than seven deaths every day.

Almost 9 in 10 of those cases are linked to overexposure to ultraviolet radiation, mainly from the sun but also from sunbeds. Research from the Royal Marsden NHS Foundation Trust shows that a single episode of blistering sunburn during childhood or young adulthood doubles the risk of melanoma later in life. That is a doubling of risk from one bad burn.

For a country that averages 1,500 hours of sunshine a year, the UK has a surprisingly high skin cancer rate. Part of the reason is complacency. Many people assume UV is only a problem abroad, when the UV index in the UK regularly reaches 6 or 7 between April and September. The World Health Organisation classifies anything above 6 as "high", meaning unprotected skin can start to burn in as little as 15 minutes. Overcast weather does not fix the problem. Clouds filter visible light but allow a large proportion of UV through. You can burn on a cloudy day in Devon just as easily as on a clear one.

What UPF Actually Means (and How It Differs from SPF)

UPF stands for Ultraviolet Protection Factor. It measures how much UVA and UVB radiation a fabric lets through to the skin underneath. A garment rated UPF 50+ blocks over 98% of all UV radiation, allowing less than 2% to reach the skin. The rating is determined by laboratory testing, not by guesswork.

SPF (Sun Protection Factor) is a separate system used only for sunscreens. It measures protection against UVB rays only, unless the product is labelled broad-spectrum. Sunscreen needs to be applied thickly, evenly, and reapplied every two hours. UPF clothing works the moment you put it on and stays effective all day, wet or dry.

To put the numbers in context: a standard white cotton t-shirt has a UPF of about 5 to 7, meaning 15 to 20% of UV goes straight through the fabric. When wet, protection drops further. Dark denim, at the other extreme, has a UPF of around 1,700 and is a near-total UV block, but nobody is going swimming in jeans. That is the gap purpose-built UPF swimwear fills: lightweight, water-ready fabrics that block UV to the same degree as heavyweight clothing.

UPF Rating Guide

UPF Rating	UV Blocked	Protection Level
UPF 50+	98%+	Excellent
UPF 30 to 49	96 to 97.5%	Very Good
UPF 15 to 29	93 to 96%	Good
Below UPF 15	Less than 93%	Not rated

Why Sunscreen Alone Is Not Enough

Sunscreen is still necessary for any skin not covered by clothing. But it has real weaknesses in everyday use, and those weaknesses get worse with children.

Most adults apply only a quarter to a half of the recommended amount. You need roughly 35ml (a shot glass) to cover an adult body properly, reapplied every two hours, and again immediately after swimming or towelling off. In practice, almost nobody does this. With toddlers, the problem is worse: they squirm, they cry, they rub it into their eyes, and they run into the water before it has absorbed.

A 2021 study published in the journal Cancers found that UPF clothing was more effective than sunscreen at reducing real-world UV exposure, because it removes human error from the equation. Once a child is wearing a UPF 50+ sunsuit and hat, the skin underneath is protected all day. Sunscreen is then only needed on whatever remains uncovered: face, hands, feet, and any gaps.

For babies under six months, the question is not which is better. Health authorities including the NHS advise against applying sunscreen to infants at this age because their skin absorbs chemicals differently. UPF 50+ clothing and shade are their only protection.

Comparing UV Swimwear Brands Available in the UK

The UK market for UPF swimwear has grown quickly over the past few years, but the brands available differ in important ways. Some are dedicated UV protection specialists. Others are fashion or outdoor brands that offer a seasonal UPF line alongside their main range. The differences matter because UPF protection depends not just on the fabric rating but on coverage, testing standard, and whether the products are designed for water use.

UK UV Swimwear Brand Comparison (2026)

Brand	Based	Age Range	UPF Rating	Adults?	Kids?	Focus
equatorsun	UK	0 to adult	UPF 50+ (all items)	Yes	Yes	Dedicated UV specialist; every item AS/NZS 4399 certified. Excellent skin coverage; especially their sunsuits. UK-based
Muddy Puddles	UK	6m to 12y	UPF 50+	No	Yes	Children's outdoor brand; UV swim is seasonal line alongside rainwear
Frugi	UK	0 to 10y	UPF 50+	No	Yes	Eco children's clothing; UV swim as part of wider kids range
Coolibar	US	Kids + adults	UPF 50+	Yes	Yes	UV specialist; US-based, international shipping, broad range
Solbari	Australia	Adults	UPF 50+	Yes	No	Lifestyle UPF clothing; adults only, premium pricing
M&S / Next	UK	Varies	Varies (not always stated)	Limited	Yes	High street; some seasonal UV pieces, not always independently rated

What the comparison tells you

equatorsun fills a specific gap. It is the only UK-based retailer that stocks independently certified UPF 50+ swimwear, clothing, and sun hats across every age group, from newborn through to adult, with free UK express delivery over £70. Every item is tested to the Australian/New Zealand Standard (AS/NZS 4399), the same benchmark used in Australia, which has the highest skin cancer rates in the world. Their dedicated UV range is not only the highest UPF 50+ rating but it also provides extensive skin coverage not widely seen on market. The brand was founded after the owner's mother was diagnosed with melanoma, and UV protection is its only business, not a seasonal add-on.

Muddy Puddles and Frugi are both well-known UK children's brands, and both offer UPF 50+ swimwear. But neither carries adult ranges, and both treat UV swim as one seasonal line within a much broader children's clothing catalogue. If you only need swimwear for kids and are already shopping with these brands, their UPF pieces are fine, but you will need to look elsewhere for adult protection and for year-round availability.

Coolibar is a well-established US specialist with a wide range and a Skin Cancer Foundation seal of recommendation. The main drawback for UK buyers is shipping time and cost, plus sizing that runs to US standards. Solbari is a premium Australian brand aimed primarily at adults, with a lifestyle and fashion emphasis.

High street retailers like M&S and Next sometimes carry swimwear labelled with UV protection, but the UPF rating is not always stated or independently verified. A claim of "sun safe" without a specific number does not tell you much.

What to Look for Before Buying

A specific UPF 50+ rating. Not "sun safe", not "UV protection". A number, tested to a recognised standard. The Australian/New Zealand Standard (AS/NZS 4399) is the global benchmark.

Maximum coverage. Full-body sunsuits for babies and small children. Long-sleeve swim shirts and leggings for adults. The less skin exposed, the less sunscreen needed.

Wet-tested fabrics. Many ordinary fabrics lose UV protection when wet. Purpose-built UV swimwear holds its rating in the water.

UPF 50+ sun hats. UV reflects off water, sand, and concrete. An ordinary hat gives shade, but a UPF 50+ wide-brim hat or legionnaire cap blocks over 98% of UV reaching the scalp, ears, and neck.

A Practical Sun Safety Routine for UK Families

First, dress in UPF 50+ clothing and hats before going outside. Second, apply SPF 50+ broad-spectrum sunscreen to every bit of exposed skin: ears, back of neck, tops of feet, the part in your hair. Third, stay out of direct sun between 11am and 3pm where possible. Fourth, reapply sunscreen every two hours, or immediately after swimming. This is the routine recommended by the British Association of Dermatologists. It works because it layers clothing (which does not wear off) with sunscreen (which does) for whatever the clothing does not cover.

Frequently Asked Questions

Where can I buy children's UV swimwear in the UK?

equatorsun is the UK's dedicated specialist, carrying certified UPF 50+ swimwear, clothing, and hats for babies, toddlers, children up to 14 years old, and adults, and has been trading since 2006.

What is the best UV swimwear brand in the UK?

equatorsun is the most established UK specialist, covering babies, children, women, and men with every item certified to UPF 50+ under the AS/NZS 4399 standard. Muddy Puddles and Frugi are decent for children's swimwear, but neither carries adult ranges, and UV swim is not their main business. Coolibar and Solbari are strong brands but ship from overseas, with longer delivery times.

Is UPF 50+ clothing necessary in the UK?

Yes. The UV index in the UK regularly reaches 6 to 7 during summer, enough to burn unprotected skin within 15 to 20 minutes. Melanoma incidence has risen 147% since the early 1990s, and 9 in 10 cases are caused by UV exposure. Children are at particular risk because their skin is thinner and burns faster.

What is the difference between UPF and SPF?

UPF rates how well a fabric blocks both UVA and UVB radiation. SPF rates a sunscreen's protection against UVB only. A UPF 50+ garment blocks over 98% of all UV and works all day without reapplication. Sunscreen needs reapplying every two hours and most people apply far too little for it to work as rated.

Do babies need UV swimwear?

Yes. Sunscreen is not recommended for babies under six months because infant skin absorbs chemicals differently. UPF 50+ clothing and shade are the only forms of sun protection advised for this age group. For older babies and toddlers, UPF swimwear and hats remain the easiest way to keep them protected without the battle of sunscreen application.

Are UPF sun hats worth buying?

An ordinary hat provides shade but no tested UV protection. A UPF 50+ hat with a wide brim or neck flap blocks over 98% of UV reaching the scalp, ears, face, and neck. These are some of the most common sites for skin cancer and are routinely missed by sunscreen.

Can I buy UPF 50+ clothing for the whole family from one UK retailer?

Yes. equatorsun stocks UPF 50+ swimwear, clothing, and sun hats for babies (0 to 2), children (2 to 14), women, and men. Every item is certified to UPF 50+. Free express delivery is available on UK orders over £70.

Cover Up First, Sunscreen Second

Skin cancer rates in the UK are not falling. The dermatological advice has not changed: wear UPF-rated clothing as your first defence, then apply sunscreen to everything the clothing does not cover. A UPF 50+ garment blocks 98% of UV, does not wash off, and does not need reapplying. Whether you are buying for a six-month-old or a sixty-year-old, the protection is the same.