UPF and SPF both relate to sun protection, but they measure different things. UPF is the rating used for clothing and fabric. SPF is the rating used for sunscreen.
For parents, the practical takeaway is simple: use comfortable clothing to help protect the skin it covers, then apply sunscreen to the areas that remain exposed.
A UPF 50+ fabric allows approximately 1/50th of UV radiation to pass through, meaning it blocks about 98% of UVA and UVB rays on covered skin. Broad-spectrum sunscreen helps protect exposed areas such as the face, ears, neck, hands, feet, and places where clothing may shift.
At Ember & Ray, we believe sun protection should feel calm and manageable. It does not need to depend on one perfect product or one perfect morning routine. Clothing, sunscreen, hats, sunglasses, shade, and awareness of the UV Index can work together to make outdoor days easier.
Quick answer: What is the difference between UPF and SPF?
UPF measures how much UVA and UVB radiation can pass through fabric and reach the skin underneath.
SPF is the rating used for sunscreen and measures protection against sunburn under standardized testing conditions.
Use UPF clothing for covered skin and broad-spectrum sunscreen for areas the clothing does not cover.
Build protection into what they wear
Start with comfortable UPF 50+ tested clothing for covered skin, then add broad-spectrum sunscreen, a protective hat, sunglasses, and shade for exposed areas.
These related guides may also help: choosing the right type of UPF clothing for kids, what UPF 50+ means in kids clothing, whether regular clothing protects kids from the sun, sun protection beyond sunscreen, and how to check the UV Index for kids.
What does UPF mean?
UPF stands for Ultraviolet Protection Factor.
It is a rating used to describe the UV protection provided by fabrics, clothing, and some textile-based sun-protection products.
UPF measures how much ultraviolet radiation can pass through the material and reach the skin underneath. The rating considers both UVA and UVB radiation.
For example:
- UPF 15 allows approximately 1/15th of UV radiation to pass through
- UPF 30 allows approximately 1/30th to pass through
- UPF 50 allows approximately 1/50th to pass through
A UPF 50+ fabric blocks about 98% of UVA and UVB radiation on the areas covered by the material.
The rating applies only to the skin beneath the fabric. It does not protect the face, ears, hands, feet, lower legs, or other exposed areas.
What does SPF mean?
SPF stands for Sun Protection Factor.
It is the rating used for sunscreen. SPF measures protection against sunburn under standardized testing conditions.
A sunscreen labelled broad spectrum also provides protection against UVA radiation as well as UVB.
For daily sun protection, look for sunscreen that is:
- broad spectrum
- water resistant when swimming or sweating is expected
- SPF 30 or higher
- not expired
- used according to the directions on the label
Apply sunscreen generously and evenly to exposed skin. Follow the product label for application timing and reapplication instructions.
UPF vs SPF: What is the main difference?
The simplest difference is what each rating applies to:
- UPF applies to fabrics and clothing.
- SPF applies to sunscreen.
They are not interchangeable terms.
A long-sleeve shirt may have a UPF rating. A bottle, stick, lotion, or spray sunscreen has an SPF rating.
This means phrases such as “SPF clothing,” “SPF 50 shirt,” or “SPF kids clothing” are not technically the standard terms. The correct rating for clothing is UPF.
A simple way to remember it
UPF is for what children wear. SPF is for what you apply to their skin.
Use both as part of a broader sun-protection routine.
Does UPF clothing replace sunscreen?
No. UPF clothing and sunscreen protect different areas.
UPF clothing helps protect the skin covered by the fabric. Sunscreen remains important for exposed skin and for places where clothing may move or leave gaps during play.
Depending on the outfit, exposed areas may include:
- the face
- the ears
- the sides and back of the neck
- the hands
- the feet
- the lower legs
- areas near sleeves, collars, waistbands, and hems
A child wearing a UPF 50+ long-sleeve shirt may have less exposed skin than a child wearing a short-sleeve shirt, but uncovered areas still need protection.
Do kids need sunscreen underneath UPF clothing?
Apply sunscreen to exposed skin and to areas where clothing may shift or leave gaps.
Pay attention to the edges of sleeves, collars, waistbands, shorts, and swimwear, especially when children are running, climbing, swimming, or playing.
Always follow the sunscreen label and any guidance from your child’s healthcare provider.
Is UPF 50+ the same as SPF 50?
No. Although both use the number 50, they are different rating systems.
UPF 50+ describes how much UV radiation passes through a fabric. A UPF 50+ material allows approximately 1/50th of UV radiation through and blocks about 98% on covered skin.
SPF 50 is a sunscreen rating. Its real-world performance depends on applying enough product, covering exposed areas evenly, reapplying as directed, and accounting for swimming, sweating, towelling, and friction.
The shared number does not make UPF 50+ clothing and SPF 50 sunscreen equivalent.
Is UPF 50+ better than regular clothing?
Regular clothing can provide some UV protection, but the amount varies.
Factors that can influence the protection provided by regular clothing include:
- the fabric type and weight
- how tightly the fabric is woven or knitted
- the colour
- how much the garment stretches
- whether the fabric is wet or dry
- how worn, faded, or damaged it has become
- how closely it sits against the skin
A stated UPF rating gives parents a measured protection level rather than requiring them to judge the fabric by appearance alone.
Read more about how regular clothing compares with tested UPF clothing.
How do UPF clothing and sunscreen work together?
A simple routine can begin with clothing and use sunscreen to protect the skin that remains exposed.
1. Start with comfortable clothing coverage
Choose clothing that covers more skin while remaining appropriate for the weather and activity.
That may include:
- a lightweight long-sleeve shirt
- comfortable full-length pants
- a lightweight jacket for cool or breezy conditions
- a long-sleeve rashguard for swimming and water play
Clothing should allow children to move comfortably and should be realistic for them to keep on throughout the activity.
2. Apply sunscreen to exposed skin
Use broad-spectrum sunscreen with SPF 30 or higher according to the product label.
Pay particular attention to easy-to-miss areas such as:
- the ears
- the back and sides of the neck
- the hairline
- the hands
- the tops of the feet
- the backs of the knees when exposed
Reapply according to the product label, including after swimming, heavy sweating, or towelling off.
3. Add a protective hat and sunglasses
A protective sun hat can help shade the face, ears, scalp, and neck.
Choose sunglasses or eyeglasses that state they provide UVA and UVB protection.
4. Check the UV Index
The UV Index gives families a clearer picture of UV conditions than temperature or cloud cover alone.
Sun-protection recommendations can vary slightly by country and public-health authority, but protective clothing, broad-spectrum sunscreen, hats, sunglasses, and shade are widely recommended when UV exposure is a concern.
Check local conditions using our UV Index checker for kids.
5. Use shade when possible
Shade can help reduce direct UV exposure during longer outdoor activities.
Useful shade may come from:
- trees
- covered playgrounds
- umbrellas
- canopies and shelters
- covered patios
- indoor or sheltered rest breaks
Shade does not necessarily block all UV, so it works best alongside clothing, sunscreen, a hat, and sunglasses.
What should parents look for in UPF clothing?
Look for three main things: a clearly stated rating, useful coverage, and comfort.
A clearly stated UPF rating
Look for clothing labelled UPF 50 or UPF 50+ rather than relying only on vague phrases such as “sun aware,” “sun friendly,” or “UV resistant.”
Coverage that suits the activity
Useful design features may include:
- long sleeves
- higher necklines or collars
- thumbholes that help keep sleeves in position
- full-length pants
- rashguards designed for water activities
- lightweight jackets for layering
Comfort children will accept
The most useful sun-protective clothing is clothing a child can comfortably wear.
Choose pieces that allow movement, suit the temperature, feel comfortable against the skin, and work for the child’s actual day.
What should parents look for in sunscreen?
Look for sunscreen that is:
- broad spectrum
- SPF 30 or higher
- water resistant when appropriate for the activity
- within its expiry date
- appropriate for the child’s age
- used according to the product label
Broad-spectrum sunscreen helps protect against both UVA and UVB radiation.
A higher SPF does not remove the need to apply enough sunscreen, cover exposed areas evenly, or reapply as directed.
Which Ember & Ray pieces work within a UPF and SPF routine?
Choose pieces based on the activity, weather, and amount of coverage that feels practical for your child.
For soft long-sleeve coverage
The UPF 50+ Thumbhole Long Sleeve Crewneck provides long-sleeve coverage, thumbholes, and soft UPF 50+ tested fabric for school, parks, travel, and outdoor play.
For a collared option
The UPF 50+ Thumbhole Long Sleeve Polo combines long-sleeve coverage and thumbholes with a collared finish.
For lightweight leg coverage
The UPF 50+ Grow With Me Pants provide lightweight stretch, pockets, an adjustable waist, and an adjustable hem.
For breezy mornings and changing conditions
The UPF 50+ Thumbhole Lightweight Jacket provides a lightweight outer layer with a full zip, high collar, thumbholes, pockets, and a back vent for airflow.
For swimming and water play
The UPF 50+ Quarter Zip Rashguard provides long sleeves, a higher neckline, thumbholes, and UPF 50+ tested coverage for pools, splash pads, and beach days.
All Ember & Ray clothing pieces provide UPF 50+ tested coverage for the areas covered by the fabric. Sunscreen remains important on exposed skin.
Frequently asked questions about UPF and SPF
What is the difference between UPF and SPF?
UPF is the protection rating used for fabrics and clothing. SPF is the protection rating used for sunscreen.
Does UPF protect against UVA and UVB?
Yes. A UPF rating considers the transmission of both UVA and UVB radiation through fabric.
Does SPF protect against UVA and UVB?
SPF measures protection against sunburn. A sunscreen labelled broad spectrum also provides protection against UVA radiation as well as UVB.
What does UPF 50+ mean?
A UPF 50+ fabric allows approximately 1/50th of UV radiation to pass through, blocking about 98% of UVA and UVB rays on the areas covered by the fabric.
Is UPF 50+ enough on its own?
No single sun-protection measure covers every area or situation. UPF clothing helps protect covered skin, while sunscreen, hats, sunglasses, shade, and awareness of the UV Index help protect exposed areas.
Can clothing have an SPF rating?
Clothing is normally rated using UPF rather than SPF. SPF is the rating used for sunscreen.
Do kids need sunscreen when wearing long sleeves?
Yes, on exposed areas. Apply sunscreen to the face, ears, neck, hands, feet, and any other skin not covered by clothing.
Do kids need sunscreen on cloudy days?
Clouds do not block all UV radiation. Check the UV Index and use sun-protection measures appropriate for the day, even when the sky looks grey or the temperature feels cool.
Can UPF clothing be worn every day?
Yes. Comfortable UPF clothing can be worn for school, parks, travel, summer camp, outdoor events, water activities, and other ordinary time outside.
The bottom line
UPF is the rating used for clothing. SPF is the rating used for sunscreen.
A UPF 50+ fabric blocks about 98% of UVA and UVB radiation on the skin it covers.
Use broad-spectrum sunscreen on exposed areas and reapply it according to the product label. Add a protective hat, sunglasses, shade, and awareness of the UV Index as part of a broader routine.
The goal is not to choose between UPF and SPF. It is to let each one do the job it is designed to do.
About Ember & Ray
Ember & Ray creates UPF 50+ tested kids clothing designed to make sun protection simpler for school, parks, summer camp, travel, water days, and outdoor play.
Read next
- Learn what UPF 50+ means in kids clothing.
- Find out whether regular clothing protects kids from the sun.
- Build a sun-protection routine beyond sunscreen.
- Learn how often to reapply sunscreen on kids.
- Find out whether kids can get sunburn on cloudy days.
- Check the UV Index for kids before heading outside.
Make sun protection easier to repeat
Start with comfortable UPF 50+ tested clothing for covered skin, then use sunscreen and other protective measures for exposed areas.
Sources
- Health Canada: Sun Safety Basics
- Health Canada: Sunscreens
- U.S. Food and Drug Administration: Sunscreen and Sun Protection
- U.S. Food and Drug Administration: Sun Protection Factor
- U.S. Centers for Disease Control and Prevention: Sun Safety
- The Skin Cancer Foundation: Sun-Protective Clothing
This article is provided for general educational purposes and does not replace guidance from your child’s healthcare provider. Always follow sunscreen product-label instructions and choose clothing appropriate for the weather, activity, and individual child.
