You're standing in a merch booth, and the price tag reads $45 for a t-shirt. Your brain does a quick math: "That's three fast-fashion tees." But the sticker doesn't tell you everything. The number that matters is GSM—grams per square meter. It's the fabric's weight, and it's the first clue to whether that tee is worth the ask.

Most budget tees sit around 130-150 GSM. They feel thin, almost translucent when held to light. A 180 GSM tee, like the Windbar standard, is noticeably denser. You can feel it in the hand—a solid heft that suggests it won't fall apart after a few washes. That sticker price starts to make sense when you realize you're paying for more cotton per square inch.

But here's the catch: GSM alone doesn't tell the whole story. Two tees can both be 180 GSM, yet one feels luxurious and the other like cardboard. The difference is in the yarn quality and knit tightness. Ring-spun cotton, which Windbar uses, is softer and stronger than regular cotton because the fibers are twisted into finer threads. That's part of what you're paying for.