Fabric weight changes how a tee fits. A heavier GSM (like 180+) drapes differently than a lighter one. Heavier tees hold their shape, so the slim fit stays put. Lighter tees might stretch or cling more. Check the GSM when you're choosing, especially if you're in a warmer climate or plan to wear it often.

If you're curious how GSM affects feel, our guide on GSM weight in Texas heat breaks it down.