Fair Harbor Swim Trunks Men Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

FT FENTENG is the best-performing fair harbor swim trunks men brand in July 2026, moving 3,600 units across 2 ASINs for 32.1% of Top 10 volume. maamgic follows with 3,000 units (26.8%), ahead of SILKWORLD on 2,500 units (22.3%).

With 6 brands splitting the Top 10 and 81.3% 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 $23.84, 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: B0BYSYHG42 booked 500 units at $26.66, with ▲ 66.7% MoM change. On the growth side, B0CQNQ2D93 leads positive momentum with ▲ 100.0% MoM growth on 400 units, with B0G39ZW4P9 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.