Summer means more time outdoors—but it also means more exposure to the sun's ultraviolet (UV) rays. Most people know they should wear sunscreen, but many aren't familiar with UPF clothing and how it can help protect their skin.
To better understand the difference, Robert West, MD breaks down how SPF and UPF work and why using both can help reduce your risk of sunburn and long-term skin damage.
Why Sun Protection Matters
Too much UV exposure can lead to sunburn, premature skin aging, and an increased risk of skin cancer. Even on cloudy days, UV rays can still reach your skin.
"Many people think about sunscreen only when they're heading to the beach or pool, but UV exposure happens during everyday activities like walking the dog, gardening, attending sporting events, or running errands," says Dr. West. "Consistent sun protection is one of the simplest ways to help reduce long-term skin damage."
What Is SPF?
SPF stands for Sun Protection Factor and measures how well sunscreen protects your skin from UVB rays, which are the primary cause of sunburn.
For example:
SPF 30 blocks approximately 97% of UVB rays.
SPF 50 blocks approximately 98% of UVB rays.
However, sunscreen only works when it's applied correctly and reapplied regularly.
"One of the biggest mistakes people make is not applying enough sunscreen or forgetting to reapply it," says Dr. West. "Even a high SPF product won't provide the expected protection if it's not used properly."
For best results, choose a broad-spectrum sunscreen with SPF 30 or higher and reapply every two hours, especially after swimming or sweating.
What Is UPF?
UPF stands for Ultraviolet Protection Factor and measures how effectively clothing blocks UV rays from reaching your skin.
Unlike SPF, which applies to sunscreen, UPF is a rating given to clothing, hats, and other fabrics designed to provide sun protection.
UPF 30 blocks about 97% of UV rays.
UPF 50 blocks about 98% of UV rays.
UPF 50+ offers the highest level of protection available.
Because UPF protection comes from the fabric itself, it doesn't wear off throughout the day the way sunscreen can.
"UPF clothing can be a great option for people who spend extended periods outdoors, especially children, athletes, outdoor workers, and anyone who has trouble remembering to reapply sunscreen," says Dr. West.
For parents looking to simplify sun protection, UPF clothing offers an easy way to add an extra layer of defense during summer activities.
UPF vs. SPF: What's the Difference?
SPF (Sun Protection Factor)
Found in sunscreen products
Protects exposed skin
Primarily protects against UVB rays
Must be reapplied regularly
UPF (Ultraviolet Protection Factor)
Found in clothing and hats
Protects covered skin
Blocks both UVA and UVB rays
Provides continuous protection while worn
SPF protects the skin you leave exposed, while UPF protects the skin you keep covered. Both play an important role in protecting your skin from UV damage.
Do You Need Both?
Yes. UPF and SPF work best together.
UPF clothing protects areas covered by fabric, while sunscreen helps protect exposed areas such as the face, neck, ears, hands, and legs.
"The most effective sun protection strategy is combining multiple layers of protection," says Dr. West. "Protective clothing, sunscreen, shade, and avoiding peak sun hours all work together to help reduce UV exposure."
Additional Summer Sun Safety Tips
In addition to wearing sunscreen and UPF clothing, Dr. West recommends:
Seeking shade during peak sun hours (10 a.m. to 4 p.m.)
Wearing a wide-brimmed hat and UV-blocking sunglasses
Staying hydrated during outdoor activities
Monitoring your skin for new or changing moles or spots
Protect Your Skin All Summer Long
Understanding the difference between UPF and SPF can help you make smarter choices about sun protection. By combining sunscreen, sun-protective clothing, and other healthy habits, you can enjoy summer while helping protect your skin for years to come.
If you have concerns about sunburn, skin changes, or other skin health issues, the team at Bookmark Medical is here to help. Schedule an appointment today and get personalized guidance to keep your skin healthy all summer long.
Questions about your care? Visit your patient portal.
