To help prevent sunburn and decrease risk of skin cancer. I've seen people who spend lots of time in the sun without any kind of protection. It's not something I hope to achieve.

Perhaps this photo of a man with significant sun exposure on only one side of his face will help explain how real sun damage is https://www.livescience.com/20743-photo-sun-damage-skin-canc...

Come to New Zealand, you’ll find out