01Open water swimmingImmersion, towelling and reflected UV in open water swimming, what fails first, and how the reapplication clock actually runs on a long swim.Open →02SurfingThe sun protection conditions of a surf session: duration, paddling friction, reflected UV off the face of a wave, and the parts of the face that always burn.Open →03SailingWhy sailing is an underestimated ultraviolet environment: long duration, surface reflection, wind that hides heat, and spray that removes the film without you noticing.Open →04Road cyclingSun protection on a long ride: sweat as the dominant removal mechanism, the fixed position that concentrates exposure, and the sites cyclists actually burn.Open →05Hill walkingSun protection on a hill day: rising ultraviolet with altitude, eight hours of exposure, pack strap abrasion, and the descent nobody accounts for.Open →06Ski touringAltitude, snow reflection, cold air and a full day of ascent. Why snow is the most demanding sun protection environment and where it fails on a tourer.Open →07Outdoor workSun protection for people who work outside: cumulative daily exposure, the sites that take it, and why a workwear based strategy beats a sunscreen based one.Open →08RunningSun protection on a long run: why sweat rate defeats most formulations, the sites runners burn, and how to build reapplication into a route.Open →09Kayaking and paddleboardingWhy paddlesports produce an unusual exposure pattern: reflected UV from below, the undersides of the arms, wet hands and no shade for hours.Open →10Snorkelling and divingThe snorkeller's exposure problem: a stationary back at the surface for hours, tropical UV, and the mask and strap lines that mark where protection failed.Open →11Tropical travelWhy British travellers burn in the tropics: a much higher UV index, a shorter and steeper sun path, unfamiliar packs bought abroad, and no acclimatisation.Open →12Under a wetsuitSun protection and neoprene: what a wetsuit covers completely, the four edges that fail, and why applying sunscreen under a suit is usually the wrong move.Open →
New files, when they land
We publish when a standard changes or when a condition is worth documenting properly, not on a schedule.
A short note when a standard changes, a regulator publishes something relevant, or a new conditions file goes up. No product recommendations, because we do not make any.