Mens Swim Trunks 9 Inch Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

FT FENTENG is the best-performing mens swim trunks 9 inch brand in July 2026, moving 3,000 units across 1 ASIN for 18.8% of Top 10 volume. ELETOP follows with 3,000 units (18.8%), ahead of maamgic on 3,000 units (18.8%).

Volume is spread across 8 brands, with the top three holding 56.3% between them. No single label controls the shelf, which usually leaves room for a well-differentiated listing to take share without outspending an incumbent. Average selling prices among the leaders run from $17.99 to $26.69, 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: B0GCBFB1TM booked 1K units at $13.49, with ▲ 25.0% MoM change. On the growth side, B0GC8WD89K leads positive momentum with ▲ 150.0% MoM growth on 500 units, with B0CQNQGDSV close behind at ▲ 100.0% MoM on 200 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.