Under Armour Underwear Men Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

BAMBOO COOL is the best-performing under armour underwear men brand in July 2026, moving 25,000 units across 5 ASINs for 56.8% of Top 10 volume. Lapulas follows with 10,000 units (22.7%), ahead of Hanes on 5,000 units (11.4%).

With 5 brands splitting the Top 10 and 90.9% 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 $14.24 to $38.56, 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, 2 ASINs forced its way in: B0C2DSSX24 booked 2K units at $42.00, with ▲ 100.0% MoM change. On the growth side, B0C3NMHPB2 leads positive momentum with ▲ 300.0% MoM growth 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.