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.
Above 90°F, 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 trying to expel. What follows is what we have learned building gear for exactly those conditions, and testing it where they are most punishing.
[Photo placeholder: Chihuahuan Desert horizon at midday. Hard light, heat shimmer, one figure small against the terrain in a Canyonlands shirt. · suggested crop 21:9]
This is reference material, not a catalog. 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 actually cools itself: the four routes of heat loss, the 580-kilocalorie trick in every liter of sweat, and what that demands from clothing. Read the page →
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. Read the page →
03 · Our Fabrics vs Synthetics in Heat
Hemp and hemp-Tencel against polyester. What each claimed advantage of synthetics costs you, in summer and in the shoulder seasons. Read the page →
04 · Natural vs Chemical UV Protection
Most UPF ratings degrade in the wash. Why protection woven into the fiber outlasts protection sprayed onto it, and what a rating actually tells you. Read the page →
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. Read the page →
06 · Beyond Clothing
Hydration, sun protection, acclimatization, and recognizing when heat has turned dangerous. The field guide to the body itself. Read the page →
We update these pages when production, field testing, or a customer teaches us something we had wrong. The questions they answer are not unique to us. Whether you choose our gear or someone else's, the right things to ask are the same: Is the fiber hydrophilic or hydrophobic. Does the weave move air. Is the fit loose enough for a cooling layer. Is the sun protection structural or sprayed on. Are the choices made for the physics of heat, or for habit.
