The Heat Guide
Most outdoor clothing was built for moderate weather and rebranded for summer. We start somewhere else. These pages explain how, in material science, design, and the practical habits that keep you comfortable when the temperature climbs.
The Heat Guide
Reference first.
Above 90°F / 35ºC, the assumptions behind synthetic activewear start to fail. Push moisture out, dry fast, manage sweat: all of it works on a 70°F run and unravels on a 100°F canyon floor, because the air can no longer absorb what the fabric is built to expel. What follows is what we have learned building gear for exactly those conditions, and testing it where they are most punishing.
Each page answers a different question. Read the one that matches what you came to learn.
01 · The Science of Staying Cool
How the body cools itself: the four routes of heat loss, the 580-kilocalorie trick in every liter of sweat, and what that demands from clothing.
02 · Dry Heat vs Humid Heat
Dew point, heat index, wet-bulb, and the single largest variable in hot-weather comfort. Why desert and coast demand opposite strategies at the same temperature.
03 · Fabric Choice in Heat
Hemp and hemp-Tencel against polyester. What each claimed advantage of synthetics costs you, in summer and in the shoulder seasons.
04 · Understanding UV Protection
Most UPF ratings degrade in the wash. Why protection woven into the fiber outlasts protection sprayed onto it, and what a rating tells you.
05 · The Trail vs The City
The applied page: timing a hot day, water math, packs and layers, and staying cool between air conditioning and asphalt.
06 · Beyond Clothing
Hydration, sun protection, acclimatization, recognizing dangerous heat, and the heat you can't leave: shifts that won't pause, rooms without air conditioning, hot nights.