Yes, tan through swimsuits genuinely work — and they work better than most people expect. They’re made from a specially engineered microperforated fabric that allows a significant portion of UV rays to pass through the material and reach your skin underneath, giving you a far more even tan with minimal or no visible swimsuit lines.

They’re not a perfect substitute for going without a swimsuit, but they’re the closest alternative available — and for anyone fed up with dealing with tan lines every summer, they’re worth serious consideration.

Below we cover exactly how the fabric works, what to realistically expect, the honest pros and cons, and what to look for before buying.

Key Takeaways

Tan through swimsuits use microperforated fabric that allows roughly 80% of UV rays through — compared to near-total blocking by standard swimwear.
They produce a significantly more even tan with far less visible swimsuit lines, though results won’t be quite identical to nude tanning.
The fabric’s UV transmission means it offers very low sun protection — roughly SPF 6 — so sunscreen on covered areas is still important.
Tan-through fabric is also quick-drying and lightweight, making it practical for beach and pool use.
Designs tend to be limited to prints and patterns, which help preserve modesty given how fine the weave is.
They work in tanning beds but with slightly reduced effectiveness compared to outdoor use.
Price is higher than standard swimwear — but longevity is comparable with proper care.

How Does Tan Through Fabric Actually Work?

Standard swimwear fabric — lycra, nylon, polyester — is woven tightly enough to block the vast majority of UV rays. Many regular swimsuits have a UPF (Ultraviolet Protection Factor) rating of 50 or above, meaning they block over 98% of UV radiation. Great for sun protection, but not great if you want an even tan underneath.

Tan through fabric works differently. It uses a very fine microperforated weave — thousands of tiny holes per square inch — that lets light pass through the gaps in the fabric rather than being absorbed or reflected. The most commonly used fabric technology for this is called Microsol, which is used by the leading brands in this space.

The result is a fabric that allows approximately 80% of UV rays through to the skin beneath, compared to the 2% or less that passes through a standard high-UPF swimsuit. This gives the covered skin an exposure level close to that of your exposed skin, which is why the tan develops so much more evenly.

It’s worth understanding this in practical terms: tan-through fabric doesn’t eliminate UV blocking entirely — it just reduces it dramatically. This is why you’ll still see a slightly deeper tan on fully exposed areas after a long session in the sun, and why these suits aren’t completely invisible in terms of tan line prevention. But the difference versus a standard swimsuit is striking.

Do Tan Through Swimsuits Really Produce an Even Tan?

In most cases, yes — noticeably more even than a regular swimsuit. After a typical tanning session, the colour difference between covered and uncovered areas is minimal and often invisible. On shorter or lighter sessions, you may not see any difference at all.

Where a slight line can appear is after extended, repeated exposure — multiple long sessions over a beach holiday, for example. The 20% of UV being blocked does add up over time, and in strong sun you may eventually notice a very faint outline where the suit sits. But it’s substantially less obvious than the sharp tan line you’d get from regular swimwear, and it fades more quickly.

For anyone who finds tan lines frustrating and doesn’t want to go the nude tanning route, tan through swimsuits are genuinely the most practical solution available.

Sun Protection: What You Need to Know

This is the most important practical point that often gets overlooked. Because tan-through fabric is designed to let UV through, it offers very little sun protection to the skin beneath — roughly equivalent to SPF 6. That’s a long way from the SPF 50+ offered by most regular swimwear and UV-protective clothing.

What this means in practice: you still need to apply sunscreen to the areas covered by your tan-through swimsuit, just as you would to your completely exposed skin. Don’t assume the fabric is protecting you from burning. In strong sun, skin under tan-through fabric can burn — it just tans more evenly too.

If you’re spending long periods in the sun, check out our guide to the best sunblocks for sun exposure and treat the covered areas the same as the rest of your body. Apply before you get dressed, let it absorb, and reapply every two hours as normal.

This also means tan-through swimwear and UV-protective swimwear (UPF 50+) are completely different products with opposite purposes. UV-protective swimwear is designed to block UV rays and protect the skin — ideal for children or anyone avoiding sun damage. Tan-through swimwear is designed to let UV through for a more even tan. Don’t confuse the two when shopping.

Benefits of Tan Through Swimsuits

The primary benefit is the one they’re designed for — a significantly more even tan with minimal lines. But there are a few other practical advantages worth noting.

The microperforated fabric is extremely lightweight and dries very quickly after swimming, faster than most standard swimwear fabrics. This makes it comfortable to wear throughout a beach day, in and out of the water, without the heavy or cold feel of wet traditional swimwear.

The fabric also tends to be comfortable against the skin in heat — the fine weave allows more airflow than a solid fabric, which helps with temperature regulation when you’re lying in the sun.

And of course, the obvious: if you’re serious about avoiding tan lines, this is the most practical way to do it without going without a swimsuit entirely.

Downsides of Tan Through Swimsuits

Style options are the most commonly cited limitation. Because the fabric is so fine, designs tend to rely on prints and patterns — florals, animal prints, geometric patterns — to help maintain modesty. Bold, solid-colour or fashion-forward styles are much harder to find. If you’re looking for a specific aesthetic, the options in tan-through fabric are significantly narrower than regular swimwear.

The fabric can also be more revealing than standard swimwear, particularly when wet or held up to strong light. This varies between products — some are more conservative than others — but it’s worth being aware of before buying. Reputable brands manage this well with their pattern choices and fabric layering, but it’s worth reading reviews specifically about modesty before purchasing.

Price is another factor. Tan-through swimsuits typically cost more than comparable standard swimwear. The specialist fabric and limited production runs drive costs up, and you’ll generally pay a premium compared to high-street swimwear at the same quality level.

Finally, as covered above: these suits provide minimal UV protection. If sun safety is a concern — for yourself or others — this isn’t the right choice, and the skin underneath still needs sunscreen.

Do Tan Through Swimsuits Work in Tanning Beds?

Yes — they do work in tanning beds, though with slightly less consistency than outdoor use. The reason is that tanning bed UV lamps emit light from a fixed angle and position, while outdoor sunlight hits the skin from multiple angles as you move throughout the day. The fine weave of tan-through fabric can create very faint pattern shadows on the skin when light hits at a consistent angle for an extended period.

In practice, this is usually minimal — tanning bed sessions are much shorter than beach days, so the effect rarely becomes visible. If you’re using a tanning bed regularly in a tan-through suit, rotating your position slightly between sessions will help keep the result even.

Top Brands to Look For

The tan-through swimwear market is a niche one, but there are a few brands that have built a solid reputation for quality fabric and fit.

Kiniki is one of the most established names in tan-through swimwear, offering a wide range of styles for both men and women using genuine Microsol fabric. Cooltan is another well-known option, particularly popular in the US market. Both brands are worth starting with if you’re new to tan-through swimwear and want a reliable result.

When shopping, look specifically for suits that state they use Microsol fabric or a named microperforated technology — generic claims of “tan-through” without a fabric specification are less reliable. Reading user reviews that specifically comment on tan results (not just fit and style) will give you the most useful real-world feedback.

How to Get the Best Results from a Tan Through Swimsuit

Apply sunscreen before putting the suit on — treat all covered areas the same as exposed skin.
Reapply sunscreen every two hours, even over the suit, particularly in strong sun.
Spend similar time on your front and back for the most even overall result.
Avoid wearing a coverup over a tan-through suit during tanning time — it defeats the purpose.
After swimming, the suit dries quickly — this is one of its practical advantages, and you can get back to tanning sooner than with standard swimwear.
Check the UV index before heading out — in very high UV conditions, shorter sessions are smarter regardless of what you’re wearing.

Caring for Tan Through Swimwear

The microperforated fabric is more delicate than standard swimwear material, so it needs a little more care to maintain its structure and UV transmission properties over time. Rinse in cold water after each use, hand wash or use a delicate machine cycle with a gentle detergent, and avoid wringing or twisting the fabric. Lay flat to dry rather than tumble drying.

With proper care, tan-through swimwear has a comparable lifespan to good quality regular swimwear — the UV-transmitting properties of the fabric don’t degrade with washing the way some UV-protective coatings do, since the transmission comes from the weave structure rather than a surface treatment.

Frequently Asked Questions

Can you tan through a regular swimsuit?

To a small extent — all fabrics allow some UV through, and lighter or thinner materials transmit more than thick, dense ones. But standard swimwear is typically designed to block UV as much as possible, so the amount getting through to your skin is minimal. You’ll still build a noticeable tan line over a beach holiday in a regular swimsuit. A tan-through suit is specifically engineered to change this by letting through the majority of UV rather than blocking it.

Will I still get tan lines with a tan-through swimsuit?

For most people in most sessions — no, or they’re barely visible. On very long or repeated exposure (multiple full days in strong sun), a faint outline may eventually appear, but it’s significantly less defined than with standard swimwear and fades faster. The result is much closer to nude tanning than anything you’d achieve with a regular suit.

Can you tan through mesh swimsuits?

Yes — mesh panels in swimwear allow more UV through than solid fabric, which is why mesh swimsuits produce less defined tan lines than solid ones. However, the UV transmission of mesh varies widely depending on the weave density. Dedicated tan-through fabric like Microsol is engineered specifically for maximum UV transmission and consistency, so it will typically outperform a mesh suit for tanning purposes.

Do tan-through swimsuits offer any sun protection?

Very little — roughly SPF 6 equivalent. This is intentional: the whole point of the fabric is to let UV through. You must apply sunscreen to all skin under a tan-through suit in the same way you would to exposed skin. Never rely on the fabric for sun protection — it isn’t designed to provide it. If sun protection is your priority, UV-protective swimwear with a high UPF rating is the right product, not tan-through.

Are tan-through swimsuits see-through?

They’re more translucent than standard swimwear, particularly in strong light. Reputable brands use print designs specifically to manage this — the patterns make the suit appear more opaque in normal conditions. When wet, the fabric can become more revealing, which is something most brands acknowledge and design around with careful pattern choices. Checking recent buyer reviews on modesty specifically is the most reliable way to judge this before buying.

What’s the difference between tan-through and UV-protective swimwear?

They’re opposite products. UV-protective swimwear (labelled with a high UPF rating, such as UPF 50+) is designed to block UV rays and protect the skin from sun damage — ideal for sun safety purposes. Tan-through swimwear is designed to let UV through for a more even tan, and offers minimal protection. Don’t buy one expecting the benefits of the other.

The Bottom Line

Tan through swimsuits do what they claim — they let enough UV through to allow your covered skin to tan alongside your exposed skin, dramatically reducing or eliminating visible swimsuit lines. The technology is straightforward and the results are real.

The trade-offs are limited style options, a higher price point, and the need to still apply sunscreen to covered areas. If you’re comfortable with those, they’re one of the most practical solutions available for anyone who wants a more even, natural-looking tan without going without a suit entirely.

For more on getting the most from time in the sun, take a look at our guide to understanding UV index for tanning and how much UV passes through regular clothing.