When you pick up a shirt, the fiber content label is your first clue about what you're getting. Say you're looking at a Windbar tee: the label might read "100% cotton". That sounds straightforward, but here's the thing—it refers to the main fabric, not the thread, collar ribbing, or other components. So don't expect a pure cotton garment down to the last stitch.

What you can expect is a general sense of the fabric's behavior. Cotton breathes, feels soft, but can shrink if you're rough with it. Polyester dries fast and holds shape but can trap heat. A blend like "cotton 60%, polyester 40%" means you'll get some breathability from the cotton and some durability from the polyester, but it won't feel exactly like either.

If you're shopping online, the fiber content might be listed in the product description. But online descriptions can be inaccurate or incomplete. The real label is the one sewn into the garment. If you buy something and the label contradicts the listing, trust the label—and maybe send it back.

Also, keep an eye out for terms like "viscose" or "modal". These are semi-synthetic fibers made from wood pulp. They're soft and drape nicely, but they can be prone to shrinking or losing shape if you don't follow the care instructions. The fiber content label will tell you they're there, but the care label will tell you how to handle them.

So, what's your practical checklist? Look at the fiber content, sure. But also glance at the care label and the country of origin. The care label tells you how to wash, dry, and iron—which is often more important for keeping a garment alive than what it's made of. Country of origin doesn't tell you about quality, but it might give you a hint about labor practices or supply chain transparency.