Underarmour Shirts For Men Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Under Armour is the best-performing underarmour shirts for men brand in July 2026, moving 16,000 units across 7 ASINs for 61.5% of Top 10 volume. MCPORO follows with 6,000 units (23.1%), ahead of BOOJO on 2,000 units (7.7%).

With 4 brands splitting the Top 10 and 92.3% 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 $19.99 to $29.98, 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: B0874WD2B2 booked 2K units at $24.50, with ▲ 100.0% MoM change. On the growth side, B095KTTSZS leads positive momentum with ▲ 200.0% MoM growth on 300 units, with B0C12C3HVZ close behind at ▲ 100.0% MoM on 400 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.