Mens Swim Trunks Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

maamgic is the best-performing mens swim trunks brand in July 2026, moving 6,000 units across 4 ASINs for 33.3% of Top 10 volume. ELETOP follows with 4,000 units (22.2%), ahead of FT FENTENG on 3,000 units (16.7%).

With 6 brands splitting the Top 10 and 72.2% 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 $17.99 to $24.65, 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: B0C6998R6Y booked 1K units at $19.99, with ▲ 11.1% MoM change. On the growth side, B0GL2114F4 leads positive momentum with ▲ 900.0% MoM growth on 500 units, with B0GL1JJTSP close behind at ▲ 700.0% MoM on 800 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.