Sunny Ocean Shop — A specification and comparison | sunnyocean.shop
The percentages flatten fast — so the interval, not the label, does the protecting.
SPF measures UVB filtering. SPF 15 filters about 93% of UVB, SPF 30 about 97% and SPF 50 about 98%. The curve flattens: raising the number from 15 to 30 adds four percentage points, but going from 30 to 50 adds only one.
Whatever the rating, sunscreen is perishable on skin. The working interval is reapplication every 2 hours of swimming or heavy sweating. A morning coat of SPF 50 that is never renewed protects less across a long day than SPF 30 renewed on the clock.
On narrow screens, swipe or scroll the plate sideways.
Clothing carries its own rating. UPF 15 blocks about 87% of UV, UPF 30 about 94%, and UPF 50+ blocks at least 98%. For children and anyone in and out of the water all day, a UPF 50+ shirt removes the reapplication problem from the torso entirely.
A practical split for a beach day: UPF 50+ shirt and the umbrella's shade for the long middle hours, SPF 30–50 on exposed skin with a two-hour reapplication clock that restarts after every swim.
The main guide page shows how these percentages sit next to the umbrella coverage figures, and the timeline block lays the two-hour clock over a full beach day.
Further reading