Mens Muscle Shirt Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Gildan is the best-performing mens muscle shirt brand in July 2026, moving 17,000 units across 4 ASINs for 35.4% of Top 10 volume. Fruit of the Loom follows with 15,000 units (31.3%), ahead of Hanes on 7,000 units (14.6%).

With 5 brands splitting the Top 10 and 81.3% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $18.92 to $21.66, 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: B06XWFZGQ9 booked 3K units at $18.80, with ▲ 50.0% MoM change. On the growth side, B0DZTNSP23 leads positive momentum with ▲ 400.0% MoM growth on 500 units, with B06XWLXMM4 close behind at ▲ 185.7% 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.