Before the number: how much skin is covered?
Clothing can reduce radiation reaching the covered skin and make protection easier to maintain. Long-sleeved tops, trousers, shirts and covering swimwear are useful during prolonged outdoor activity. The first criterion is the protected area: excellent fabric does not protect shoulders, neck or legs if those areas remain uncovered.
Ordinary clothes can provide a good barrier, but performance varies widely. Weave, thickness, composition, colour and conditions of use affect UV transmission. Looking dark or heavy is not enough to establish a garment’s protection; a verified rating is more informative than a generic “sun-protective” claim.
Choose coverage suited to the activity and temperature. An uncomfortable garment may be removed during the longest exposure. For children, workers and athletes, freedom of movement, ventilation and heat management are part of the choice alongside skin protection.
UPF and SPF are not the same label
Fabrics use UPF, the Ultraviolet Protection Factor; sunscreen products commonly use SPF. A UPF value describes material performance measured using a test method. It is not necessarily a substance “built into” the fabric: protection may come from fibre and weave characteristics, treatments or a combination.
UPF 50 means that, under test conditions, roughly one fiftieth of effective UV radiation passes through, or about 2%. UPF 30 corresponds to roughly one thirtieth. These figures concern the tested material, not guaranteed protection for the whole person or a number of safe hours outdoors.
Read the label, testing conditions and care instructions. Categories and requirements depend on the standard used: not all products described as UV-protective necessarily have the same certification. Consider the rating together with neckline, sleeves, length and fit, because openings and uncovered areas remain exposed.
Water, stretching, wear and washing
Fabric protection can change when a garment is wet, highly stretched or worn. The effect is not identical for every material: for swimming, choose a product designed and assessed for that use. An ordinary wet T-shirt should not automatically be treated as equivalent to swimwear with a declared protective performance.
An excessively tight fit can open the weave; tears, thinned areas and garment alterations can reduce coverage. Follow washing instructions and check whether the manufacturer specifies limits relating to wear or treatments. A printed rating does not make a product effective forever under every condition.
Clothing has the advantage of not requiring repeated sunscreen application beneath every covered area, but it must remain on and intact. When a shirt is removed, sleeves are rolled up or swimwear is changed, reassess newly exposed areas: protection depends on behaviour, not simply purchasing the garment.
Hats: protecting ears and neck too
A broad-brimmed hat shades more areas than a simple peaked cap. Models with rear coverage can help protect the neck; check that the fabric provides coverage and the hat stays secure during movement and wind. A sparsely haired or bald scalp needs particular attention.
A peak mainly protects the front and often leaves ears and the back of the neck exposed. Do not abandon a required helmet to wear a hat: UV protection during sport and work should be integrated with required safety equipment without inappropriate alterations.
A hat does not replace sunglasses or eliminate radiation reflected onto the face. Combine it with other measures, especially near water or snow. For children, choose an appropriate size and design, avoiding accessories that could create hazards during play.
Children, sport and work: completing protection
Swim shirts, lightweight trousers and breathable garments can help maintain coverage without unnecessarily restricting activity. Not every fabric is equally comfortable in every climate: check mobility and fit and plan shaded breaks. For children, easy-to-wear clothing supports consistent protection but still requires adult supervision.
Apply sunscreens to uncovered areas and reapply as directed, especially after water, sweat and towelling. Add sunglasses, a hat and planning based on the UV index. No garment, even with a high UPF, justifies deliberately extending exposure.
For outdoor work, consider coverage, visibility, mandatory equipment and heat risk together. The most useful solution is one that can be used throughout the activity and incorporated into work organisation, rather than relying solely on individual product choice.
Sources and update
- ARPANSA — Sun protection using clothing
- WHO — Ultraviolet radiation
- American Academy of Dermatology — Sunscreen FAQs
Editorial revision: 17 October 2026. Educational information that does not replace medical assessment.