We firmly believe Trek Cotton Knit is the best t-shirt fabric on the planet. It delivers workwear-level durability with the broken-in comfort of classic heavyweight cotton — engineered to survive years of hard wear without losing its feel.

The unique dual-layer construction dries 4x faster than a standard cotton tee, making it as practical on the trail as it is around town. It's not a certified sustainable fabric, but we'd argue the most sustainable t-shirt is simply the one that lasts the longest.

70% Cotton / 30% Polyester · 190 gsm (5.5 oz.)

Tech Flannel is the evolution of classic flannel — engineered to look like a heritage piece while performing like a base layer. The tri-blend construction does the heavy lifting: polyester adds durability and quick-dry performance, rayon delivers the soft hand-feel of high-end cotton, and spandex provides mechanical stretch for a full range of motion. No shrinking, no stiffness, no compromises. You'll find it in our Men's & Women's Highland Flannels.

That said, don't sleep on traditional flannel. It's a reliable natural insulator with workwear toughness and a timeless mountain aesthetic — which is exactly why we still use it in the Juniper Flannel Shacket.

75% Polyester / 23% Rayon / 2% Spandex · 240 gsm (7 oz.)

Nylon is the workhorse of the outdoor industry, and for good reason. Our heavy-duty plain weave and ripstop nylon holds its shape whether it's stuffed into a pack or soaked in a rainstorm — and it won't absorb moisture, actively moving sweat to the surface to evaporate.

The benefits stack up fast: high abrasion resistance, built-in UV protection, and a tight weave that acts as a natural windbreak without sacrificing breathability. It's why we reach for it across so many products — hats, pants, shorts, and jackets alike.

100% Performance Nylon · 50–60 gsm (1.5–2 oz.)

Micro-Perforated Woven Polyester is our flagship fabric — and it earns that title. It delivers a combination of structural durability and mechanical airflow that most technical outdoor fabrics simply can't match. The tight woven construction resists abrasion and snagging, so it handles a backpack strap or a stray branch without complaint.

Unlike traditional jersey fabrics, it holds its shape and won't cling to skin, allowing air to circulate freely through the micro-perforations. The result is a fabric that looks structured and moves with you. Currently featured in our Langley Button-Up Shirts, with more products on the way.

88% Polyester / 12% Spandex · 140 gsm (4 oz.)