6 ms·
98% = 2 units of UV reaching the skin 99% = 1 unit of UV reaching the skin Thus 98% filtering lets in 2x as much as 99% filtering
by rrsp 1y ago
98% = 2 units of UV reaching the skin
99% = 1 unit of UV reaching the skin
Thus 98% filtering lets in 2x as much as 99% filtering