For many people, their first experience with sun-protective clothing is a rash guard or swim shirt. It makes sense: when you're spending hours at the beach or pool, covering more skin is an easy way to add UV protection. But sun exposure doesn’t stop when you leave the water, and the shirt you want for swimming may not be the same shirt you want to wear for 18 holes, a tennis match, gardening, sightseeing, or an afternoon on the boat.
Today, sun-protective clothing goes well beyond traditional swimwear. You can find UPF-rated apparel designed for sport, travel, leisure, and everyday life, which means there’s more to consider than whether a label says “sun protection.” UPF tells you how well a fabric protects against UV radiation, but it doesn’t tell you how that shirt will feel when the temperature climbs.
What Does UPF Actually Tell You?
UPF stands for Ultraviolet Protection Factor and measures how much UVA and UVB radiation can pass through a fabric and reach your skin. At UPF 50, approximately 98% of UVA and UVB radiation is blocked, making UPF 50+ the highest UPF protection category for sun-protective apparel.
That's important information when choosing a sun shirt, but UPF is a measure of UV protection—not cooling, breathability, weight, stretch, or comfort. Two shirts can both carry a UPF 50+ rating and still feel very different when you're wearing them outside on a hot day.
Is There A Difference Between A Sun Shirt And A Swim Shirt? Why Can Some Sun Shirts Feel Hot?
Sun shirts can be made from different fabrics and constructed for very different uses. Swim shirts and rash guards, for example, are often designed with the water in mind, where priorities may include coverage, stretch, durability, quick drying, and a fit that stays in place while swimming. Those are valuable features for a garment designed for the beach or pool, but they don't necessarily tell you how the shirt will feel during several hours of activity on land.
For hot-weather wear, fabric weight, fit, breathability, moisture management, and construction can all affect comfort. A shirt that feels great in the water may feel different while you're golfing, walking, gardening, or sightseeing in the heat, which is why it's worth looking beyond the UPF number and considering what the garment was designed to do.
Do Sunshirts Keep You Cooler?
Yes and this is where fabric technology can make a difference. IBKÜL’s Iceƒil® apparel combines UPF 50+ sun protection with patented cooling technology engineered to lower skin temperature by up to 5°F, so sun protection and cooling comfort can work together in the same garment.
Iceƒil® is also cool to the touch, lightweight and breathable, with moisture-wicking and quick-drying performance to help manage perspiration when temperatures rise. Four-way stretch allows the fabric to move comfortably with you, whether you’re swinging a golf club, serving on the tennis court, tending the garden, walking along the beach, or exploring somewhere new.
Sun Protection Beyond the Beach
A sun shirt can be useful anywhere you're spending extended time outdoors, not just at the beach or pool. UV Protective shirts for tennis, golf, pickleball, walking, boating, gardening, travel, and everyday activities can all mean hours of UV exposure, even if you're nowhere near a bathing suit.
That’s also why style and versatility matter. If sun protection is built into a shirt you genuinely enjoy wearing, it becomes easier to make coverage part of everyday life rather than something reserved for beach days. A sun-protective shirt can look polished enough for lunch or travel while still delivering the performance you want when you're active outside.
And that versatility is something IBKÜL customers are already putting to use. One Florida customer shared that she wears her cooling sun shirt for golf, gardening, walking, and exercise, while another customer wears hers while boating because she wanted more sun coverage without feeling hot or uncomfortable.
What Should You Look for in a Sun Shirt?
Start with the UPF rating. UPF 50+ provides the highest category of UPF protection, making it a strong choice when sun coverage is the priority. But don't stop at the number. Think about where and how you'll wear the shirt and look for features that will make you comfortable enough to keep it on.
For hot days and active use, check for cooling apparel. That may mean lightweight, breathable fabric; moisture-wicking and quick-drying performance; comfortable stretch; and cooling technology. Coverage matters too, particularly if you're choosing long sleeves to protect more of your skin during extended time outdoors.
And don't overlook how the shirt looks and feels. If you're going from golf to lunch, sightseeing all afternoon, or spending a day on the boat, a sun shirt that performs without looking like technical swimwear can be a lot more versatile.
The Best Sun Protection Is the Protection You’ll Wear
UPF 50+ isn't limited to rash guards, swim shirts, or days by the water. Sun-protective clothing can be designed for the course, court, garden, boat, vacation, and everyday life—and the right fabric can deliver protection without sacrificing comfort.
When choosing a sun shirt, look beyond the UPF rating and ask what else the garment is designed to do. The best sun shirt isn't just one that protects you. It's one you'll actually want to keep wearing.
