Gym Shirts Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Gildan is the best-performing gym shirts brand in July 2026, moving 9,000 units across 2 ASINs for 22.5% of Top 10 volume. Trendy Queen follows with 8,000 units (20.0%), ahead of MCPORO on 6,000 units (15.0%).

Volume is spread across 8 brands, with the top three holding 57.5% between them. No single label controls the shelf, which usually leaves room for a well-differentiated listing to take share without outspending an incumbent. Average selling prices among the leaders run from $9.99 to $21.99, which frames the price band a competing listing has to justify.

Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, one ASIN forced its way in: B09DCB77Z4 booked 3K units at $17.09, with ▲ 50.0% MoM change. On the growth side, B0CSWGBR4L leads positive momentum with ▲ 100.0% MoM growth on 2K units, with B0CWGJZ35S close behind at ▲ 100.0% MoM on 2K units.

The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.