SPF stands for Sun Protection Factor which is a relative measure of how long a sunscreen will protect you from ultraviolet (UV) rays. (see chart). That said, no sunscreen blocks 100% of UV rays and the main thing that affects protection level is applying it correctly. Dermatologists recommend using 3 tablespoons of sunscreen to protect your whole body. SPF ratings are significantly decreased if you don’t apply enough and most people only apply 1/3 of the sunscreen they need. So make sure you use enough and don’t neglect hard to reach and easily forgotten places like your ears, feet and upper back and remember to reapply. Lastly, we don’t care if you use our sunscreen, just use sunscreen.