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Glam Journal

What is the purpose of a rash guard

Author

Andrew Henderson

Updated on April 28, 2026

Rash guards are a type of athletic shirt. They are made to protect your skin against rashes and harmful UV Rays from sunlight. To make them lightweight and perfect for surfing, rash guards are made with spandex and nylon or polyester.

What is the point of rash guard?

Rash guards provide added coverage to protect against the sun’s harmful rays and help prevent sunburn. Some rash guards even include UPF 50+ properties for built-in UV protection, but remember to still use sunscreen.

Do you wear bra under rash guard?

GUARANTEED SUN PROTECTION: Bra is perfect under any sun protective shirt or rash guard or as a stand along swim bra with your favorite pair of shorts or swim bottoms. Certified UPF 50+ which blocks 98% of UV rays, preventing burns and skin damage.

Is it OK to wear a rash guard?

Should You Wear a Rash Guard? Here’s the good news — you should wear a rash guard any time you want. Not only will your dermatologist thank you, but you’ll also find that a rash guard is a perfectly utilitarian piece of clothing that makes sense to wear.

Do you need to wear sunscreen under rash guard?

Do You Need to Wear Sunscreen Under a Rash Guard? The beauty of wearing UV-protective garments is that you don’t need to wear sunscreen underneath, but you do need to apply it to areas that are otherwise exposed to sunlight.

Do rash guards stretch when wet?

The fabric that makes up a rash guard is designed for the water. So it doesn’t stretch out as quickly as the material in a t-shirt does.

Do people swim in rash guards?

If you are a surfer, odds are you have a rash guard in your wardrobe, and you may be wondering if it is appropriate to wear when you go swimming. The answer is yes — a rash guard can be used for swimming, though it may not be as comfortable as other options.

Do rash guards make you hot?

Not to be confused with a wetsuit, a rash guard’s basic purpose is not to keep you warm; the extra layer that a rash guard provides is an easy alternative when the weather a too warm for a full wetsuit. Temperature aside, a rashie can also serve as a defense against foreign sea particles.

What's the difference between wetsuit and rash guard?

A wetsuit is what surfers wear in the freezing ocean water to stay warm. … Rash Guards are NOT wetsuits! They are not designed to keep you warm. They are designed to prevent rashes from surfing.

Do rash guards keep you warm in cold water?

A rashguard holds a little heat close to your body and blocks constant bouts of cold water. It keeps the muscles warm to prevent cramps and muscle weariness, and helps with muscle support. They also help prevent abrasions caused from boards, life vests or wetsuits.

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What do you wear under a swimsuit?

For example, if your swimsuit doesn’t have enough support, you can try wearing a bra underneath. If your swim shorts don’t have any lining, in most circumstances, it would probably be better to wear boxers or briefs rather than going commando. Females can wear panties with board shorts for additional comfort.

Should you put sunscreen under your clothes?

It stands for “ultraviolet protection factor,” and it’s the sun protection rating system used for clothing—it’s similar to SPF in sunscreen. … If you’re playing beach volleyball in your favorite white cotton tee, which probably has a UPF of about 5, then yes, you should apply sunscreen underneath it.

How do you know what size rash guard to get?

What size rash guard should I get? To choose a rash guard size, you should first measure your chest. Then compare that measurement to the size chart that’s shown on the product page and order based on your chest measurement. Depending on fit and comfort preference, you can go up or down a size!

Where do you wear a rash guard?

For the guys out there, rashguards are great to wear with your favorite board shorts or swimming trunks. With multiple styles to choose from, wear your rashguard all day long with ease, both in and out of the water. For example, take O’Neill’s line of ‘BASIC’ rashguards for men!

Do rash guards help you float?

A rash guard that doubles as a buoyancy aid that keeps you afloat in the water when you are in danger. The Sun-float-shirt keeps the swimmer face-up while in the water, ensuring maximum breathing capability.

When should you wear a rash guard?

For swimming or splashing around at the beach, wear your rash guard over a matching bikini or one-piece bathing suit. That way, your bust will be supported and you’ll be ready to dive in at a moment’s notice.

Are rash guards supposed to be tight fitting?

With water sports, for example, a loose-fitting rash guard can be cumbersome when swimming or surfing. This means you’ll need one that has a tight fit close to the skin, which gives it less resistance when you are moving. Paddler’s, boaters and those seeking sun protection should check out a looser fit.

Is a rash guard just a compression shirt?

compression shirt – what’s the difference? Compression garments support muscles and increase blood flow, which may improve athletic performance. Rash guards typically have a more relaxed fit and are made to protect the skin from the sun, sand or even a surfboard.

What can you use instead of a rash guard?

Most rash guard shirts are made out of a nylon/spandex blend so they are both strong and stretchable. If you want to go for a substitute, then go for a stretchable close weave polyester shirt.

Can you wear a rashguard under a wetsuit?

Rash Guard You’ll need to keep your upper body warm and cozy as well. You can choose from a wide variety of undershirts, but a rash guard or compression shirt makes for a good first layer in colder waters. Like diving shorts, they provide an extra layer of warmth and protection from wetsuit chafing.

What does a woman wear under a rashguard?

What do you wear under a rash guard or swim shirt? Women typically wear a swim suit top or one piece swimsuit under a rash guard or swim shirt for extra modesty.

Do rash guards make you cold?

A typical rash guard worn alone, made of spandex, nylon or polyester will not provide a lot of warmth. This is because it is not thick or strong enough to work like a wetsuit, which keeps a layer of warm water close to the skin. … This stops the cold air from chilling your skin, making you feel warmer too!

Are rash guards breathable?

Polyester: Polyester rash guards offer maximum breathability and sweat wicking, but lack the same stretch and flexibility of those composed of a lycra blend. Nylon-Spandex: With a nylon-spandex rash guard, a surfer will get stretch, a tight fit, breathability, and a quick drying.

How thick is a rash guard?

Rash guards range from around 0.5 mm – 4 mm thick. The thickness of a rash vest is directly related to how warm it will be. If you’re buying a rash guard for diving, remember that neoprene compresses with depth.

Can I wear a bra as a swimsuit?

The fabrics in regular bras are not designed to be worn for any length of time submerged in water, whether natural water (fresh or sea) or chemically treated water (pools). If you want the support of a bra while swimming, you may want to invest in a bra-sized swimsuit or bikini top.

Why do swimmers slap themselves?

Also part of an athlete’s race routine, it’s something that gets an athlete ready to go. Male swimmers sometimes slap themselves red, especially on their pectorals. Women will also do this or use a closed fist instead. This slapping increases blood flow in the muscles which is helpful to the “warmup” process.

Why do men's swimsuits have liners?

The main purposes of the mesh liner inside swim trunks are to prevent chafing by creating a barrier between sensitive areas of skin and the trunks; and to provide support to the genitals while swimming, by hugging them close to the body and keeping them out of harm’s way during physical activity.

What is UPF 50?

Ultraviolet Protection Factor (UPF) indicates how much UV radiation (both UVB and UVA) a fabric allows to reach your skin. For example, a UPF 50 fabric blocks 98 percent of the sun’s rays and allows two percent (1/50th) to penetrate, thus reducing your exposure risk significantly.

Do I need sunscreen if I wear long sleeves?

A long sleeve sun shirt with a UPF 50 rating means you are receiving the equivalent protection of a sunscreen with an SPF 50 rating. So in this situation – no, it’s not necessary to also wear sunscreen underneath your clothing.

Do I need sunscreen on my legs?

Commit to applying and reapplying sunscreen to your legs, particularly your shins and the backs of your knees, Dr. Rosen says. These are both easy-to-miss spots. This is especially important for women, because the lower legs are the most common site for melanoma to appear, according to the Mayo Clinic.

Why do BJJ wear rash guards?

Your rash guard goes under your gi, and it helps protect your skin from scrapes and skin burns. A rash guard also keeps your body warm and helps your muscles stay supple while grappling. Rash guards are made of polyester and spandex, two materials that are useful in soaking up the sweat before it seeps into your gi.