UPF range

Protection category

Effective UV-R transmission (%)

UPF rating

15 - 24

Good

6.7 - 4.2

15, 20

25 - 39

Very Good

4.1 - 2.6

25, 30, 35

40 - 50, 50+

Excellent

Less than 2.5

40, 45, 50, 50+