The Learning Lab

Building a Sustainable Sunscreen Habit for Athletes

By Kari Kenner May 11, 2026 |

Sunscreen for Year-Round Athletes The athletes who stay outside year-round learn this fast: sunscreen is not a beach product. It is gear. The same people who obsess over hydration packs, recovery metrics, split times, wetsuits, tire pressure, and weather windows still forget one of the most consistent stressors on the...

Is zinc oxide sunscreen actually better than chemical sunscreen?

By Kari Kenner April 26, 2026 |

Zinc oxide sunscreen is often the better choice if you want broad, stable UV protection with a low risk of skin irritation. That’s not just marketing. It comes from how zinc oxide works on the skin and how it handles sunlight. Chemical sunscreens can still be effective, but they rely...

Mineral vs Chemical Sunscreen Mega Guide

By Kari Kenner February 22, 2026 |

Quick answer: Mineral sunscreen uses zinc oxide or titanium dioxide to sit on the skin surface and block UV rays. Chemical sunscreens absorb UV radiation and convert it to heat. For sensitive skin, children, and reef-conscious travel, mineral sunscreen with non-nano zinc oxide is widely recommended. Table of Contents Mineral...

What Is Bemotrizinol? Tinosorb?

By Kari Kenner December 13, 2025 |

Short Answer Summary Bemotrizinol, often marketed under the name Tinosorb, is a modern chemical sunscreen ingredient used widely in Europe and Asia. It absorbs UV radiation and converts it to heat. It is more photostable than older chemical filters, but it is still petroleum-derived, still chemically active on skin,...

7 Reasons Sunscreen Stings Eyes. And How to Avoid It.

By Kari Kenner August 20, 2025 |

Picture this: you're getting ready for a beautiful day at the park with your family. You dutifully apply sunscreen to everyone's faces, and within minutes, your toddler is rubbing their eyes and crying. Sound familiar? You're not alone if you've ever dealt with sunscreen eye irritation during family outdoor adventures....

How to Apply Sunscreen Correctly

By Kari Kenner June 18, 2025 |

"Do I really need to reapply every two hours? Should I put it on under makeup? Is a little bit enough if I'm just running errands?" Sound familiar? You're not alone. Most people aren't applying sunscreen correctly, leaving their skin exposed to UVA and UVB damage. Here's how to get...