You need a drying-rate test result, ideally compared with a reference fabric, before the claim goes on the product. "Quick" is a comparative word: quicker than what? A supplier's description of the fabric is a starting point, not evidence.

Choose a drying method

AATCC publishes several methods for moisture management. TM199 measures drying time with a moisture analyzer, TM200 measures drying rate at absorbent capacity using air flow, and TM201 measures drying rate on a heated plate. They measure under different conditions, so results from one method should not be compared with another. Pick one with your laboratory, based on how you want to describe the product, and use it consistently.

Compare against something meaningful

A single drying number tells customers very little. A more useful basis is a comparison under the same method, for example your tank fabric against a standard cotton jersey of similar weight, or against your previous tank. Then the claim can say what it is quicker than. Keep the comparison fabric's details with the report so the claim can be checked later.

Test it washed as well as new

If the fabric's performance depends on a finish, it may change with laundering. Test new fabric and fabric after an agreed number of cycles under a named procedure such as ISO 6330. If the washed result no longer supports the claim, tone the claim down or change the fabric.

Word the claim to match the result

Wording such as "dries faster than standard cotton jersey in laboratory testing" stays closer to the evidence than an unqualified "quick-dry". If your markets have advertising substantiation rules, the test report is the evidence you will need to show, so file it with the product records.

In short: pick one drying method, test against a stated reference, test after washing, and write the claim to fit what you found.

Also think about the rest of the garment. Heavy printed areas, thick bindings or bonded seams can dry more slowly than the base fabric. If the claim is made about the garment rather than the fabric, test a garment panel that includes those features, or keep the claim explicitly about the fabric.