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+ |