Can You Get Sunburn Through Clothes?

Yes. Some clothing allows enough ultraviolet radiation to pass through the fabric to affect the skin underneath.

A shirt may look completely opaque to your eyes while still allowing some UV radiation through.

How much protection it provides depends on several factors, including:

• Fabric construction
• Material
• Fabric weight and thickness
• How tightly the fabric is woven or knitted
• Stretch
• Moisture
• Wear and age
• UPF rating

This is why simply covering your arms with a shirt doesn't automatically mean you have strong sun protection.

For people who spend long periods outdoors, the type of clothing matters.

What Is UPF Clothing?

UPF stands for Ultraviolet Protection Factor.

It is a rating system used for clothing and textiles that indicates how effectively a fabric reduces UV radiation reaching the skin.

For example, a garment rated UPF 50 is designed to allow only a small fraction of UV radiation to pass through the tested fabric.

That's different from simply assuming that any long-sleeve shirt provides the same level of protection.

UPF-rated clothing gives outdoor users a clearer way to understand the sun-protective performance of the fabric they are wearing.

UPF vs. SPF: What's the Difference?

UPF and SPF are related to sun protection, but they're not the same thing.

SPF (Sun Protection Factor) is most commonly associated with sunscreen applied directly to the skin.

UPF (Ultraviolet Protection Factor) is used for fabrics and clothing.

A simple way to remember the difference is:

SPF → sunscreen

UPF → clothing

They can also work together.

Sun-protective clothing can help cover larger areas such as your torso and arms, while sunscreen remains important for exposed areas such as your face, ears, neck, and hands.

Why Some Shirts Provide Better Sun Protection Than Others

Two shirts that look almost identical can perform differently in the sun.

Here are some of the biggest factors.

1. Fabric Construction

One of the most important factors is how much open space exists between the fibers.

A dense fabric structure generally creates a stronger physical barrier between sunlight and your skin.

Looser or more open fabrics may allow more UV radiation to pass through.

You can sometimes see this yourself.

Hold a lightweight shirt up toward a bright light.

If you can easily see significant light through the material, the fabric may provide less coverage than a denser fabric — although visible light alone isn't a substitute for an actual UPF rating.

2. Stretch Can Change Coverage

Stretching fabric can increase the space between fibers.

That means a shirt that fits extremely tightly may not behave exactly the same way as the same fabric in a relaxed state.

For outdoor activities, a comfortable fit also improves mobility.

You should be able to cast a fishing rod, paddle, hike, climb, or work without constantly fighting your clothing.

3. Wet Clothing Can Behave Differently

This matters particularly for:

• Fishing
• Boating
• Kayaking
• Beach activities
• Hot-weather hiking
• Outdoor work

Clothing may become wet from water, rain, or sweat.

Moisture can change the optical properties of some fabrics and may affect how they protect against UV radiation.

This is one reason purpose-built outdoor clothing can be useful for activities where getting wet is part of the day.

4. Fabric Condition Matters

Outdoor shirts take abuse.

They get washed repeatedly, stretched, exposed to sunlight, scraped against equipment, and worn for long periods.

Over time, fabric can become thinner or damaged.

A worn-out shirt with thinning areas or holes obviously won't provide the same physical coverage as it did when new.

Inspect frequently used outdoor clothing occasionally, especially around the shoulders, upper back, sleeves, and elbows.

Why Long Sleeves Make Sense in Hot Weather

At first, wearing long sleeves on a hot sunny day may sound uncomfortable.

But experienced anglers, hikers, boaters, and outdoor workers often wear lightweight long sleeves for a simple reason:

coverage.

A long-sleeve shirt covers areas that otherwise receive hours of direct sunlight:

• Shoulders
• Upper arms
• Forearms
• Upper back
• Chest

Instead of repeatedly applying sunscreen across all of these areas, clothing provides continuous physical coverage while you're wearing it.

The key is choosing the right long-sleeve shirt.

Heavy cotton and a lightweight performance sun shirt can feel very different in summer conditions.

What Makes a Good Sun Protection Shirt?

Sun protection shouldn't be the only consideration.

If you're spending several hours outdoors, the shirt also needs to be comfortable enough that you'll actually want to keep wearing it.

Look for a combination of the following features.

UPF-rated fabric

A stated UPF rating gives you more useful information than simply assuming a shirt blocks UV because it has long sleeves.

Lightweight construction

For warm-weather activities, unnecessary bulk quickly becomes uncomfortable.

Lightweight shirts are easier to wear during long days outside.

Breathability

Air movement matters when temperatures rise.

Breathable construction can make extended outdoor activity considerably more comfortable.

Moisture management

Sweat is unavoidable during many outdoor activities.

Performance fabrics designed to move moisture away from the skin and dry efficiently can help reduce the heavy, damp feeling associated with traditional shirts.

Good coverage

Long sleeves provide additional coverage for the arms.

A hood can extend coverage around the head and neck when needed.

Some outdoor shirts also incorporate thumb holes or other features that help extend coverage toward the hands.

Sun Protection for Fishing

Fishing is one of the activities where sun exposure can easily be underestimated.

You might leave early in the morning when temperatures are comfortable and stay on the water well into the afternoon.

That can mean several hours of exposure.

There is another factor around water: reflected sunlight.

When you're fishing from a boat, kayak, shoreline, pier, or dock, you're often surrounded by open areas with very little shade.

That's why fishing clothing commonly emphasizes:

UPF protection + lightweight fabric + breathability + moisture management.

A lightweight long-sleeve fishing shirt can provide consistent upper-body coverage without requiring heavy layers.

Sun Protection for Hiking

Hiking presents a similar problem.

A short walk can turn into several hours outside, and exposed trails may provide very little shade.

Sun exposure also changes as you move through different environments.

You might start under tree cover and eventually reach:

• Open trails
• Ridge lines
• Rocky terrain
• Fields
• Coastal paths

Instead of constantly adding and removing protection, lightweight sun-protective clothing can provide consistent coverage throughout the hike.

For warm-weather hiking, look for clothing that balances sun protection, breathability, moisture management, and freedom of movement.

What About Regular Cotton T-Shirts?

A regular cotton T-shirt isn't automatically useless against sunlight.

Any fabric between your skin and the sun can provide some degree of physical coverage.

The problem is consistency.

Different shirts can vary substantially depending on fabric weight, weave, color, stretch, moisture, and condition.

A basic short-sleeve T-shirt also leaves large areas exposed, including much of the arms.

If you're only outside briefly, that may not be a major concern.

But if you're spending an entire afternoon fishing, hiking, boating, or working outside, purpose-built sun protection clothing becomes much more useful.

Do You Still Need Sunscreen When Wearing UPF Clothing?

UPF clothing doesn't eliminate the need for sunscreen.

Think of clothing as one part of your sun-protection strategy.

Apply sunscreen to areas that remain exposed, such as:

• Face
• Ears
• Neck
• Hands
• Lower legs, depending on what you're wearing

A hat, sunglasses, shade, and thoughtful timing of outdoor activities can also contribute to reducing sun exposure.

Choosing a Shirt for Long Days Outside

There isn't one perfect outdoor shirt for every situation.

Someone standing in a river fly fishing has different needs from someone hiking an exposed trail.

But for warm, sunny conditions, a practical outdoor shirt should generally balance four things:

Sun protection.

Breathability.

Moisture management.

Comfortable coverage.

If one of these is missing, you'll probably notice it after several hours outside.

That's why many modern fishing and outdoor shirts combine lightweight performance fabrics with long sleeves and UPF-rated protection.

The goal isn't to wear more clothing.

It's to wear clothing that works better for the conditions.