Choosing a good sun hat gives you shade you never have to reapply. It covers your scalp, forehead, ears, and part of your neck all day, so your sunscreen has less work to do. Reading the labels correctly is what turns that shade into real sun protection on a garden bed, a hiking trail, or a beach towel.
The two rating systems measure different things. UPF tells you how much of the sun's UVA and UVB passes through a fabric, while SPF tells you how much extra UV dose sunscreen-covered skin can take before it burns, mostly from UVB. Use a wide-brim hat made of tightly woven material for the skin it shades, and broad-spectrum SPF 30 or higher on everything it leaves open. Neither one replaces the other in the UPF vs SPF debate; they cover different parts of your body.
When considering SPF vs UPF, each rating system serves a distinct role in keeping you covered outdoors. Understanding SPF vs. UPF allows you to manage daily sun exposure without relying solely on lotions that can wash away.
At American Hat Makers, we have been making hats since 1972 as a family-owned business, and sun exposure is one of the most common reasons shoppers come to us. Our roundup of the best sun hats shows the range of styles, but the numbers on the tag are what tell you how a hat will perform.
Key Takeaways
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UPF measures fabric that blocks UV, and SPF measures sunscreen's sunburn protection on skin.
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A UPF 50 fabric lets about 2% of UV through, but brim size, weave, and fit decide how much skin the hat shades.
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Sunscreen still belongs on your face, ears, and neck because UV reflects and scatters under a brim.
Model Wearing: AHM Soaker | Eggshell
What Do Sun Protection Labels Actually Measure?
Sun protection labels measure two separate things: how well a fabric blocks UV radiation, and how well a sunscreen delays a burn. Understanding UPF vs SPF helps you choose the right defense against ultraviolet radiation. UPF covers UVA rays and UVB rays passing through cloth, while SPF is a lab score tied mainly to UVB sunburn.
A reliable sun protection factor guards bare skin, while UPF fabrics block ultraviolet radiation before it ever makes contact.
What Does UPF Measure in Clothing and Hats?
The ultraviolet protection factor (UPF) is a lab measure of how much UV radiation passes through a fabric to reach your skin. It counts both UVA rays and UVB rays. The number works like the bottom of a fraction. A UPF 50 fabric lets through about 1/50 of the ultraviolet radiation that hits it.
A UPF rating describes the tested fabric and its baseline UV protection. For UPF clothing and hats, the ultraviolet protection factor (UPF) indicates fabric density rather than total shade. Two hats made from the same UPF 50 fabric can shade very different amounts of skin depending on design.
What Does SPF Measure in Sunscreen?
The sun protection factor (SPF) compares how much UV it takes to burn skin with sunscreen against skin without it. The FDA describes SPF as a measure of the amount of solar energy needed to produce sunburn on protected skin, relative to bare skin.
SPF ratings are not a timer. Choosing the right sun protection factor depends on outdoor intensity. Many people think SPF 15 lets them stay out 15 times longer, but the amount of UV you get depends on sun strength.
One hour at 9 a.m. can deliver the same dose as 15 minutes at 1 p.m. Different SPF ratings also assume precise laboratory application that rarely matches real-world outdoor conditions.
Applying a quality SPF sunscreen shields your skin by absorbing or reflecting solar energy during peak hours.
Why Do Both UVA and UVB Protection Matter?
UVB rays cause most sunburns, while UVA rays penetrate deeper to cause skin aging and long-term sun damage. Both forms of UV radiation play a direct role in skin cancer.
Unchecked sun damage accumulates over years of routine sun exposure. Chronic UV exposure without broad-spectrum defense significantly accelerates premature aging.
The Skin Cancer Foundation notes that both forms of ultraviolet radiation contribute to cellular damage and increase health risks.
Because SPF comes from a sunburn test, the FDA notes that the number primarily indicates UVB protection. A broad-spectrum sunscreen has also passed testing against UVA rays, so always look for those words on the label.
Our post on skin cancer awareness month covers more about why daily coverage counts year-round.
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UPF (fabric) |
SPF (sunscreen) |
|---|---|---|
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What it rates |
UV passing through cloth |
Sunburn dose on skin |
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UV types |
UVA and UVB |
Mostly UVB |
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Broad spectrum |
Built into the test |
Must be on label |
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Reapplication |
None |
Every 2 hours |
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Changes with use |
Wetness, stretch, wear |
Sweat, water, rubbing |
How Should You Compare UPF and SPF Numbers?
When evaluating UPF vs SPF, compare each number only within its own system. Looking at SPF vs. UPF helps clarify how fabrics and lotions tackle ultraviolet radiation differently.
Ultraviolet protection factor (UPF) figures describe the share of UV radiation a fabric lets through. Meanwhile, sun protection factor figures describe a sunburn ratio on skin under ideal lab application.
How Much UV Radiation Do UPF 30, 40, and 50 Fabrics Block?
UPF ratings translate into blocking percentages with easy math: divide 1 by the rating.
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UPF 30: about 3.3% gets through, so roughly 96.7% is blocked
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UPF 40: 2.5% gets through, so 97.5% is blocked
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UPF 50: a fabric blocks 98 percent of the sun's rays and lets 2% reach your skin
The Skin Cancer Foundation rates UPF 30 to 49 as very good and UPF 50+ as excellent, and a fabric needs UPF 50 to earn its Seal of Recommendation. When buying sun-protective clothing, these ratings give you a clear benchmark.
Choosing certified UPF 50 clothing ensures you block out at least 98% of harmful ultraviolet radiation. This level of defense is ideal for people experiencing prolonged sun exposure.
Sun protection clothing labeled UPF 50+ blocks over 98% of UV radiation. The Australian/New Zealand standard uses three classes: Minimum at 15, Good at 30, and Excellent at 50 and 50+.
What Changes Between SPF 30, SPF 50, and SPF 100?
A higher sun protection factor gives more sunburn protection, but the gains shrink as the number climbs. SPF 30 sunscreen filters out roughly 97% of UVB in lab testing, SPF 50 sunscreen about 98%, and SPF 100 about 99%.
Those percentages assume a thick, even coat. Most people apply far less than lab amounts, so real protection lands lower.
Dermatologists recommend SPF 30 or higher, and an SPF 50 sunscreen you apply well beats an SPF 100 you skimp on. Understanding these SPF ratings ensures you choose appropriate protection for your environment.
Using a reliable SPF sunscreen minimizes overall UV exposure during extended periods outside.
Why Aren't UPF 50 and SPF 50 Interchangeable?
The two numbers come from different tests on different things. In the comparison of SPF vs. UPF, the fundamental distinction lies in what each score evaluates. UPF 50 is a fixed fabric measurement across UVA rays and UVB rays.
SPF 50 is a sunburn ratio, mostly UVB, that depends on how much you apply and whether you've sweated it off. Quality sun protective clothing rated UPF 50+ delivers continuous UV protection, whereas sunscreen thins out by the hour.
Wearing UPF 50 clothing shields covered skin without the reapplication demands of an SPF 50 sunscreen. This constant barrier provides steady defense against ultraviolet radiation throughout the day.
How Do You Choose a Hat for Sun Protection?
Pick a hat with a brim at least 3 inches wide all around, a solid crown, a tight weave, and a fit that stays put. Each of those features controls how much skin the hat shades, no matter what the fabric scores.
How Much Coverage Should the Brim and Crown Provide?
The American Cancer Society calls a hat with at least a 3-inch brim all around ideal, since it shades the ears, eyes, forehead, nose, and scalp. A dark, non-reflective underbrim helps cut UV bouncing up from water. Baseball caps leave the ears and neck open, which are common spots for skin cancer.
For gardening or hiking, we steer shoppers toward a brim that dips slightly at the back. The crown should sit low enough on your head that sun can't slip in at the temples. Many of our styles have a metal band sewn into the brim, so you can pull the front down against low afternoon sun.
How Do Straw Weave, Mesh Panels, and Other Materials Affect Coverage?
Tightly woven fabric, felt, and leather block more UV than open straw. Hold a hat up to the sun. If you see pinpoints of light through the crown or brim, UV is getting through those gaps too. Straw like the Capri straw sun hat is light and cool, and a tight weave holds up better than a loose, open one.
Mesh panels add airflow on hot days, which keeps you wearing the hat longer. The trade-off is that the vented area shades less. A hat with mesh around the crown and a solid brim keeps your face covered while your head breathes. Darker colors absorb more UV than pale ones.
Why Should You Check Each Hat's UPF Label?
Only some hats carry a tested UPF rating, and the rating applies to that style's fabric. We list materials on each product page, from Toquilla palm to nylon mesh, so read the details style by style. A UPF label on one hat says nothing about a different hat in the same line, and our craftsmanship guarantee covers build quality, separate from UV performance.
How Can American Hat Makers Help You Find a Comfortable Fit?
A hat that blows off or rides up stops protecting you. Measure your head using our hat size chart, which lists inches and centimeters. Many styles hide an adjustment system behind the sweatband, and a full size reducer can snug up a hat between sizes. Our team will help you choose a size by email at info@americanhatmakers.com.
Model Wearing: AHM Cabana | Steel
How Do You Use Hats, Clothing, and Sunscreen Together?
Wear a wide-brim hat and UPF-rated clothing as your base layer of shade. Wearing UPF clothing creates physical defense against UV radiation across covered areas.
Adding dedicated sun protection clothing reduces the surface area where lotions can wash away or rub off. Combining a hat with UPF 50 clothing shields vulnerable areas and minimizes cumulative sun damage.
Then put broad-spectrum sunscreen on every patch of skin still open. Selecting an appropriate SPF sunscreen keeps exposed areas safeguarded against unexpected UV exposure.
Where Should You Apply Sunscreen When Wearing a Hat?
Cover your face, ears, neck, and the tops of your hands even under a wide brim. UV reflects off sand, water, concrete, and snow, scattering through the air onto shaded skin.
An effective sun protection factor guards these exposed patches against scattered ultraviolet radiation and reduces long-term sun damage. Smooth an even layer of SPF sunscreen across your neck and ears to counter indirect UV exposure.
Dermatologists suggest about 1 ounce of sunscreen, roughly a shot glass, for the body and at least a teaspoon for the face. Apply it about 15 minutes before heading out.
When Should You Reapply Sunscreen Outdoors?
Sunscreen reapplication should happen at least every 2 hours, and right after swimming, sweating, or toweling off. Hats and clothing don't wear off this way, which is one reason they pair so well with SPF sunscreen. Keep a small tube in your bag, since a sweaty hike or an hour in the waves wipes off far more than you notice.
How Can Wetness, Stretch, and Wear Affect Clothing Protection?
UPF clothing loses protection when it gets wet or stretched. Dark biking shorts can test around UPF 85 unstretched and drop to UPF 8 when worn, then fall to UPF 4 when wet.
Repeated washes can also degrade UPF-rated clothing over time, reducing its UV protection. For hats, a soaked brim and a crushed crown both let more light through, so reshape and dry your hat after a swim.
Our guide to the best color to wear in the sun explains how shade choice plays in.
How Do Shade and Timing Help Reduce UV Exposure?
Plan outdoor time outside peak hours whenever possible. The CDC notes UV is strongest in the continental U.S. from 10 a.m. to 4 p.m. daylight saving time, and it advises protection whenever the UV index hits 3 or higher.
Shade from trees or umbrellas helps limit direct UV exposure, but keep your hat and sunscreen on there too. For trips, the best packable sun hats fold into a bag so you always have coverage on hand.
Pair a Well-Fitting Sun Hat With Protection for Exposed Skin
A sun hat and sunscreen work as a team. UPF tells you how much UV passes through fabric, across UVA and UVB. SPF tells you how much sunburn protection sunscreen gives, mostly against UVB, and only as long as you apply enough and reapply. A UPF 50 fabric lets about 2% of UV through, but brim width, weave, vents, and fit decide how much skin the hat covers.
When you shop, look for a brim of 3 inches or more, a tight weave, and a size that stays put in the wind. Then put broad-spectrum SPF 30 or higher on your face, ears, neck, and hands. Browse our women's sun hats or men's sun and outdoor hats, and email info@americanhatmakers.com if you'd like help picking a style or size.
Frequently Asked Questions
Is UPF as good as SPF?
In the question of UPF vs SPF, neither is inherently better because they serve different purposes. The ultraviolet protection factor (UPF) rates fabric against both UVA rays and UVB rays without wearing off.
While UPF rates textiles, sun protection factor measures sunscreen efficacy on skin, primarily guarding against UVB rays. Using UPF clothing alongside broad-spectrum sunscreen provides complete UV protection.
Do you actually need UPF clothing?
You don't strictly need dedicated sun protective clothing, but it makes staying safe much easier on long outdoor days. Dark, tightly woven regular clothing blocks a lot of UV radiation too.
However, certified UPF-rated clothing gives you a tested number you can rely on without guessing. Choosing sun protective clothing with a UPF 50+ rating ensures maximum shielding from solar rays.
Can you get sunburned while wearing UPF 50 clothing?
Yes, it's possible. UPF 50 still lets about 2% of UV through, and wet or stretched fabric lets in more.
While sun protection clothing significantly lowers your overall risk, uncovered skin and reflected UV can still burn you. The Skin Cancer Foundation advises combining UPF 50 clothing with an SPF 50 sunscreen for complete coverage during long sun exposure.
How long does UPF protection last in clothes?
It varies by fabric and care. Most quality sun protection clothing is built to keep its rating for dozens of washes, while fabric finishes may fade with heavy use. Fading color or stretched fabric are clear signs to replace an item.
Is UPF 50 enough, or should you look for UPF 100?
UPF 50 is enough for most people, since it already blocks about 98% of UV and rates as excellent. Higher numbers add little extra blocking. Coverage, fit, and a tight weave make a bigger difference than chasing a higher UPF rating.