GSM
Glossary — merch.am
GSM
Grams per Square Meter (GSM) — fabric weight standard. Light cotton T-shirt: 130-160 GSM. Standard tee: 160-200. Premium heavy: 200-250. Hoodie cotton: 280-340. GSM correlates with durability and cost. Higher GSM = thicker, heavier, more expensive but more premium feel.