Mens Under Armour Shorts Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

BALENNZ is the best-performing mens under armour shorts brand in July 2026, moving 20,000 units across 1 ASIN for 36.4% of Top 10 volume. BOOJO follows with 15,000 units (27.3%), ahead of Under Armour on 10,000 units (18.2%).

With 6 brands splitting the Top 10 and 81.8% 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 $15.79 to $24.99, 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: B0874W4WR5 booked 2K units at $24.99, with ▲ 0.0% MoM change. On the growth side, B0CZ9XY7Y1 leads positive momentum with ▲ 150.0% MoM growth on 500 units, with B08JGBB9N1 close behind at ▲ 100.0% MoM on 20K 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.