Mexoryl SX will raise questions about optimal sunscreen protection
A new sunscreen called Mexoryl SX will raise questions about optimal sunscreen protection.
SPF is often misunderstood. SPF applies only to UVB...not UVA. UVB causes the familiar sunburn. Explain that SPF is an estimate of how long a person can stay in the sun without obvious sunburn.
For example, if a person would burn in 10 minutes with NO protection, then an SPF 15 sunscreen will protect 15 times longer or 150 minutes...and an SPF 30 would protect 30 times longer or 300 minutes.