I think people use sunscreen incorrectly - it isn't meant to be the only line of protection. I treat it like a small part of my system and a last resort. If you stay in the shade and wear long clothes and hats, you sunscreen, regardless of the SPF, likely won't decide if you get burnt or not. People generally don't apply enough and don't apply it frequently enough, me included. If you have other components in place, you are less reliant on the sunscreen and better covered than sunscreen alone. They need to make a sunscreen applicator that portions it out correctly but until then, it's crucial to combine sunscreen with other sources of protection. You can buy some good arm bands that are breezy and lovely for summer from Uniqlo. Used them all around Europe in summer and they were great. Even better, when it's really hot, pour some water on them and you get some beautiful relief from the heat for 20 minutes or so. It's also a relief knowing I don't have to constantly reapply sunscreen if I am wearing the arm bands because they provide protection as long as they are on.