Don't get hung up on the thread count or the exact GSM (grams per square meter). For a travel tee, what matters is how it behaves after a few hours in a backpack. GSM tells you weight and thickness, but it doesn't predict collar stretch.

Also ignore the tag that says "pre-shrunk." That just means the fabric was treated to minimize shrinkage in the wash—it says nothing about how it handles being folded and jammed into a duffel.

And skip the idea that you need a special "travel tee" fabric. Ring-spun cotton isn't the problem; it's how you treat it.