UPF 50+ is UPF 50+ — worry about coverage
Pick the swimsuit that covers what you want to protect, not the one with the most expensive tag.
Honestly, any UPF 50+ swimsuit does the job — the rating is standardized. That means it blocks at least 98% of UV rays. The real difference is how much skin it actually covers.
So think about your usual sunburn spots: shoulders, chest, back of the neck. A long-sleeve rash guard or a high-neck one-piece will protect those areas way better than a bikini with UPF stickers. Fabric matters a little — tight weaves like nylon/spandex hold up well, and avoid anything super thin or stretchy that might lose protection when wet. But most mass-market UP
