What Is UPF 50+? And why does it matter for surfers?
If you spend a lot of time in the ocean, you've probably seen UPF 50+ mentioned on rash guards, surf swimsuits and other sun-protective clothing. But what does it actually mean?
For surfers, UPF can be especially useful because you're often exposed to the sun for hours at a time. A UPF-rated rash guard or surf swimsuit adds an extra layer of protection while you surf — without needing to constantly reapply sunscreen to the skin it covers.
Here's everything you need to know about UPF 50+ swimwear and why it matters.
What does UPF 50+ mean?
UPF stands for Ultraviolet Protection Factor. It measures how effectively a fabric protects your skin from ultraviolet (UV) radiation.
A fabric rated UPF 50+ blocks at least 98% of UV radiation, allowing only a very small amount to reach the skin underneath.
The higher the UPF rating, the more UV radiation the fabric blocks. UPF 50+ is considered excellent protection for clothing.
It's important to remember that UPF applies to the fabric, not automatically to every piece of swimwear. The construction, color, stretch and condition of the material can all affect how much protection a garment provides.
UPF vs. SPF: What's the difference?
UPF and SPF are both related to sun protection, but they measure different things.
UPF is used for clothing and fabrics. It measures how much UVA and UVB radiation gets through the material.
SPF is used for sunscreen. It primarily measures protection against UVB radiation and is based on how much UV exposure is needed to cause sunburn on protected skin compared with unprotected skin.
So, when you're choosing a rash guard or surf swimsuit, look for a UPF rating. When you're choosing sunscreen for your face, legs or other exposed skin, look for an appropriate SPF.
The two work together rather than replacing each other.
Why do surfers get so much sun exposure?
A surf session can mean spending a lot of time outside — and not just when you're standing on your board.
You might spend most of your session:
- Paddling through the water
- Sitting on your board waiting for waves
- Walking along the beach
- Waiting for the next set
- Surfing under direct sunlight for hours
Water can also reflect UV radiation, adding to your overall exposure.
And because surfing is often done in warm, sunny destinations, it can be easy to underestimate how much sun you're getting.
Why wear a UPF 50+ rash guard?
A UPF 50+ rash guard provides protection for the skin covered by the fabric while also helping reduce the need to apply sunscreen to those areas.
This can be particularly useful on your:
- Shoulders
- Back
- Chest
- Arms
It's also one of the easiest ways to add more sun protection without having to stop your surf session every few hours to reapply sunscreen to covered areas.
Of course, you'll still need sunscreen on exposed skin such as your face, neck, hands and legs.
What about a UPF 50+ surf swimsuit?
A surf swimsuit can offer the same benefit while giving you more coverage than a bikini.
For surfers, a secure one-piece can also be practical because you don't have to worry about constantly adjusting your swimwear while paddling, popping up or falling into the waves.
If you're spending several hours in the ocean, combining a UPF 50+ surf swimsuit with sunscreen on exposed areas can be a simple way to build sun protection into your surf outfit.
UPF protection isn't only for hot weather
You might associate sun protection with tropical beaches, but UV exposure doesn't disappear when the temperature drops.
You can still be exposed to UV radiation on cloudy days or during cooler surf sessions. That's why sun-protective clothing can be useful throughout the year, not just during the hottest summer days.
Does UPF 50+ replace sunscreen?
No.
Think of UPF clothing as one part of your sun-protection routine, not a replacement for sunscreen.
A good surf setup can include:
UPF 50+ surfwear + sunscreen on exposed skin + shade and regular breaks from the sun.
For areas covered by properly rated UPF 50+ fabric, the clothing provides the protection. For everything else, sunscreen remains important.
How long does UPF clothing last?
UPF protection can depend on the fabric and how the garment is made and cared for.
Stretching fabric significantly can affect how much UV protection it provides, which is one reason it's important to follow the care instructions for your swimwear.
Regular wear, washing and general use can also affect fabrics over time. If your surfwear becomes noticeably worn or damaged, it may no longer perform exactly as it did when new.
Why UPF 50+ is useful for surfers
Surfing means spending a lot of time outdoors, often in direct sunlight and around reflective water. A UPF 50+ rash guard or surf swimsuit gives you an easy way to add sun protection while you're doing what you love.
And the benefits don't stop at UV protection. A good rash guard can also help prevent board rash and chafing, while a well-fitting surf swimsuit can give you the confidence to move freely without constantly adjusting your swimwear.
So whether you're heading out for a quick morning session or spending the whole day in the ocean, UPF 50+ surfwear is a simple and practical addition to your surf wardrobe.