In this episode of Shawn & Mike Take a Hike, we’re diving into a phrase you’ll hear echoed across trailheads and gear shops everywhere: “Cotton kills.” But what does that actually mean?

Whether you’re a total newbie or just getting serious about hiking and backpacking, understanding how fabrics perform in the wild can be a literal lifesaver. We break down the science of moisture retention, the dangers of hypothermia, and why cotton clothing can turn into a major liability on the trail—even in warmer weather. Then we’ll offer up smarter, safer fabric alternatives and give you real-world examples of what to wear, when to wear it, and how to stay dry, warm, and comfortable no matter what the weather throws your way.

If you’ve ever reached for a cotton t-shirt before a hike, this episode is for you. Tune in and learn how a simple clothing choice can make or break your time on the trail—and maybe even save your life.