Most of us are familiar with sunscreen and know to look for an SPF rating before heading outdoors. What often gets less attention is the protection offered by clothes, hats and other fabrics. Understanding UPF vs SPF is an important part of sun protection, particularly if you’re spending long days outside.
While the two ratings are often mentioned together, they measure different things. Understanding UPF vs SPF meaning can help you choose the right combination of clothing and sunscreen for different activities, weather conditions and levels of UV exposure. In this guide, we'll explain how each rating works and why they work best together.
What is SPF and What Does It Protect Against?
SPF stands for Sun Protection Factor. It's a rating used to measure how effectively a sunscreen protects the skin from UVB radiation, the type of ultraviolet radiation most closely associated with sunburn and a major contributor to skin cancer risk.
SPF ratings indicate how much UVB radiation is blocked by the sunscreen:
- SPF 30 blocks approximately 97% of UVB rays.
- SPF 50 blocks approximately 98% of UVB rays.
While SPF is an important part of sun protection, it doesn't tell the whole story. SPF measures protection against UVB radiation only. UVA radiation can also damage the skin and contribute to premature ageing and skin cancer risk, which is why broad-spectrum sunscreens are recommended.
No sunscreen lasts all day. To maintain protection, sunscreen should be reapplied every two hours and after swimming, sweating or towelling off. For everyday use, the Cancer Council recommends SPF 50 or SPF 50+ broad-spectrum, water-resistant sunscreen as the minimum level of protection.
Source: Cancer Council Australia — Sunscreen and Sun Safety.
What is UPF and What Does It Protect Against?
UPF stands for Ultraviolet Protection Factor. You can think of it as the fabric version of SPF. Instead of measuring sunscreen performance, it measures how effectively clothing, hats and other fabrics block ultraviolet radiation before it reaches your skin. Unlike SPF, which focuses on UVB protection, UPF covers both UVA and UVB rays.
When it comes to UPF clothing vs sunscreen, it's not a case of choosing one over the other. Sunscreen protects exposed skin, while UPF-rated clothing and sun hats add an extra layer of protection by creating a physical barrier. UPF ratings indicate how much UV radiation can pass through a fabric:
- UPF 30: Blocks approximately 96.7% of UV radiation.
- UPF 50: Blocks approximately 98% of UV radiation.
- UPF 50+: Allows less than 2% of UV radiation to pass through the fabric, blocking at least 98% of UVA and UVB rays.
If you're comparing UPF 50 vs SPF 50, the numbers don't actually measure the same thing. UPF tells you how much UV radiation a fabric blocks, while SPF measures the level of protection provided by sunscreen.
In Australia and New Zealand, the AS/NZS 4399:2020 standard is the recognised benchmark for testing and classifying sun-protective clothing and accessories. OZ Smart's UPF-rated products are tested and rated to this standard. If you'd like to learn more, read our guide on what UPF 50+ means.
Source: ARPANSA — Australian Sun Protective Clothing.
UPF vs SPF: Key Differences
When comparing SPF vs UPF, it helps to remember that they measure different types of protection.
- What It Measures: SPF measures sunscreen protection against UVB radiation. UPF measures how much ultraviolet radiation a fabric blocks.
- Types of UV Radiation: SPF primarily relates to UVB protection, while UPF covers both UVA and UVB rays.
- How It’s Used: SPF is applied directly to exposed skin. UPF protection comes from clothing, hats and other fabrics.
- How Long It Lasts: Sunscreen needs to be reapplied every two hours, particularly after swimming or sweating. UPF protection remains in place while the garment is being worn and remains in good condition.
- Australian Standards: Sunscreens sold in Australia are regulated by the Therapeutic Goods Administration (TGA). UPF-rated clothing and accessories are tested against the AS/NZS 4399:2020 standard.
Used together, SPF and UPF provide complementary layers of protection, helping reduce UV exposure during everyday outdoor activities.
Sources: Therapeutic Goods Administration (TGA) — Sunscreen Regulation in Australia.
Does UPF Clothing Really Work?
It's a fair question. If you've ever wondered how does UPF clothing work, the answer is quite simple: specially designed fabrics help block ultraviolet radiation before it reaches your skin. When a garment has been tested and rated to the AS/NZS 4399:2020 standard, you can be confident its level of protection has been independently assessed.
For people asking if UPF clothing really works, certified UPF-rated clothing provides consistent protection every time it's worn. Unlike sunscreen, there's no waiting period before heading outdoors, and the protection doesn't wash off with sweat, water or a quick dip at the beach.
Moreover, not all clothing provides the same protection. An ordinary white cotton shirt may only achieve a UPF rating of around 5 to 10, allowing a much higher amount of UV radiation to pass through the fabric. Only garments tested to the AS/NZS 4399:2020 standard can be assigned an official UPF rating, making it easier to understand exactly how much protection you're getting.
How to Layer UPF Clothing and Sunscreen Together
The most effective approach is to use both forms of sun protection together. Quality UPF 50+ sun protection clothing provides reliable coverage for large areas of the body, while sunscreen helps protect exposed skin that clothing doesn't cover.
Step 1: Start with UPF 50+
Start with UPF 50+ rated clothing, such as long sleeves, long pants or arm sleeves. This helps protect larger areas of the body and reduces the amount of skin that needs sunscreen throughout the day.
Step 2: Add a Protective Hat
Wear a UPF 50+ rated hat for additional coverage. Wide brim, legionnaire, bucket, and ponytail hats can all help protect the face, ears and neck, making them a practical choice for different outdoor activities.
Step 3: Cover Exposed Skin with Sunscreen
Apply SPF 50+ broad-spectrum, water-resistant sunscreen to any exposed skin, including the face, hands, lower legs and areas around clothing edges. Don't forget commonly missed spots such as the tops of the ears and the back of the neck.
Step 4: Seek Shade During Peak UV Hours
Seek shade during peak UV hours, particularly between 10am and 2pm. Understanding Australia's UV Index can help you identify when these higher-risk periods are likely to occur.
Step 5: Stay on Top of Reapplication
Reapply sunscreen every two hours, and after swimming, sweating or towelling off. UPF-rated clothing continues to provide protection while being worn and does not require reapplication. If you're spending the day at the beach, a sand-free beach towel can also make it easier to stay comfortable between swims and sunscreen top-ups.
